AMD Phenom II review

Mike D. 8 Jan, 2009 at 12:41am ET Article published in Tech

Detail and Specifications

We obtained the following Phenom II X4 940 and 920 processor specifications from AMD:

Processor Frequency: X4 940 (Black Edition) = 3.0GHz / X4 920 = 2.8GHz
L1 Cache Sizes: 64K of L1 instruction and 64K of L1 data cache per core (512KB total L1 per processor)
L2 Cache Sizes: 512KB of L2 data cache per core (2MB total L2 per processor)
L3 Cache Size: 6MB (shared)
Memory Controller Type: Integrated 128-bit wide memory controller *
Memory Controller Speed: Up to 1.8GHz with Dual Dynamic Power Management
Types of Memory Supported: Support for unregistered DIMMs up to PC2 8500 (DDR2-1066MHz)
Memory Bandwidth: Up to 17.1GB
HyperTransport 3.0 Link: One 16-bit/16-bit link @ up to 3.6GHz full duplex (1.8GHz x2)
HyperTransport 3.0 Bandwidth: Up to 14.4GB/s
Total Processor Bandwidth: Up to 31.5 GB/s total bandwidth
Packaging: Socket AM2+ 940-pin organic micro pin grid array (micro-PGA)
Fab location: Fab 36 wafer fabrication facilities in Dresden, Germany
Process Technology: 45-nanometer DSL SOI (silicon-on-insulator) technology
Approximate Transistor count: ~ 758 million (45nm)
Approximate Die Size: 258 mm2 (45nm)
Max Ambient Case Temp: 62° Celsius
Nominal Voltage: 0.875 – 1.5 Volts
Max TDP: 125 Watts

*NOTE: MC configurable for dual 64-bit channels for simultaneous read/writes

As you can see, quite a bit has remained constant and quite a bit has changed. We see the L1 and L2 cache configurations remain consistent, but L3 cache has been increased from 2MB to 6MB in the Phenom II. Memory controller configurations have remained consistent with an 1800MHz, 128-bit controller that can operate in an unganged, dual 64bit configuration for simultaneous reads and writes. The HyperTransport 3.0 configuration also remains at 3.6GHz full duplex and is unchanged from past Phenom configurations.

Amazingly, the transistor count in the Phenom II has almost doubled to 758 million from 450 million in the 65nm Phenom. The huge increase in L3 cache is the biggest contributer to this increase. Nominal voltage is listed between 0.875V and 1.5V, but the default voltage for the 3GHz X4 940 is 1.35V and is dropped at idle with Cool’n’Quiet enabled.

We were very pleased to see AMD continue to utilize socket AM2+ for the Phenom II. Buyers jumping on Intel’s i7 platform have been pretty frustrated having to shell out for new motherboards and new memory along with their shiny new i7 processors. AMD clearly didn’t want to put buyers through that sort of ordeal and have put together a very thoughtful backwards compatibility. AMD tells us that just about any AM2+ board can support Phenom II so long as BIOS support exists. You can expect to see BIOS updates from just about all manufacturers to enable Phenom II support. As always, you can check out AMD’s recommended motherboard list or your motherboard manufacturer’s website.

On the topic of backwards compatibility, AMD has also provided some interesting tidbits of information relating to their upcoming AM3 processors due out in 2009. We’ve been informed that these processors support both DDR2 and DDR3 and continue to be backwards compatible with socket AM2+ motherboards. Buyers only need to purchase AM3 motherboards if they want to utilize DDR3 memory with their processor. AMD states:

“…This approach allows users, businesses, system builders and OEMs to migrate across memory technologies at their own pace, when the time is right. AMD’s approach continues to be one of flexibility and compatibility to maximize platform longevity. In the current economic climate, we believe this approach makes more sense than ever.”

We wholeheartedly agree with them.

phenom2_cpuz1

This certainly wouldn’t be a CPU review without the requisite CPU-Z screenshots. Version 1.49 of CPU-Z recognizes the Phenom II – Deneb – processors. As you can see, we have some of the same, and some welcome differences like a 3GHz clock speed, 45nm technology and 6MB of L3 cache. The L1 and L2 cache configuration has not changed and neither has the HT configuration or the system base clock.

phenom2_cpuz4

The memory configuration also remains the same as the Phenom II’s predecessors. An 1800MHz memory controller clock speed and native support for 1066MHz DDR2 continues to be standard.

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Comments

8 Jan 2009 ~ 1:42am QCH Very nice review... It's a shame that the Phenom II didn't do better but I am encouraged that AMD/ATI are back on the right path.

Oh, and INTEL... Get Icrontic some review items!!!
8 Jan 2009 ~ 1:49am Winfrey srsly Intel ^^
8 Jan 2009 ~ 7:58am Garg Seems like a viable upgrade for someone like me with an older system and not a lot of money lying around. I wonder how long it'll be before i7 prices drop, though?
8 Jan 2009 ~ 8:35am Zuntar Nice review Mike!

I'm still gonna wait for the next round of fighters to hit the ring.
8 Jan 2009 ~ 3:40pm Khaos Excellent review, Mike. Very informative.

I sure wish that AMD's FPU performance was better. That's what is really killing them in the benchmarks, synthetic or otherwise.

The memory bandwidth on both the i7/X58 and Phenom II platforms is more than adequate for today's applications.
8 Jan 2009 ~ 3:45pm lemonlime Thanks all. Just got some updates from AMD:

Immediate OEM availability from: Dell, Cyber Power and Vigor

Immediate part availability from: NewEgg, NCIX, mwave, zipzoomfly, Amazon and Tiger Direct.
8 Jan 2009 ~ 7:44pm Komete Great review, I'm still reading it. I finally see an Amd upgrade path for me. There is only one thing I wish you guys could have done in your review if you would have had the time. That is, if you could have posted max over clock performance of the AMD chips in with all the benchmarks. I notice, no one does this anymore.

Now back to more reading
8 Jan 2009 ~ 8:09pm Snarkasm Mike's still working on the OC.
8 Jan 2009 ~ 9:31pm Komete After reading through, I have to say one of these chips would be more than enough for me (with a little ocing involved). I wonder if the Phenom II x3's and x2's will overclock well when they come out. Would be nice.

Once the prices drop some I may have to snatch one up. Great review fellas! Way to go Lemon lime!
9 Jan 2009 ~ 2:53am Mt_Goat Excellent review Mike! Intel may still hold the lead in overall performance. But I think the Phenom II is still a very viable platform when price is brought into the picture. For most folks this is more power then they would ever need and comes at a much better price point.
9 Jan 2009 ~ 3:11am DrLiam Great review and I agree this is a step in the right direction for AMD. A few aces up their sleeves would be nice though.
11 Jan 2009 ~ 5:06pm James I observed that the comparisons were made with a 2Ghz quad core Phenom II. A retailer near me sells the Phenom II Quad core at a 3Ghz clock speed. Would that mean that I could add another 33% to the benchmarks for AMD and say that it is a better choice than the i7?
I can't wait until AMD blows Intel out of the water as far as multithreading with their release of the 12 core processor I read about last year.
11 Jan 2009 ~ 5:09pm Snarkasm 12 cores is no better than 4 in today's software environment, really. There's such a tiny proportion of software that's prepared for parallel processing that it'll make no difference in the near future.
11 Jan 2009 ~ 5:11pm Thrax Unfortunately not. The Core i7 is simply a superior chip in virtually every regard. AMD has improved their standings with the Phenom II, but as the conclusion notes it's a feat that is a day late and a dollar short.

By the time AMD releases a 12 core chip, Intel will be well on their way to 8 core chips with hyperthreading to support 16 threads at a time. Anyone who wants AMD to succeed must wait for the Bulldozer in 2010.

James wrote:

I observed that the comparisons were made with a 2Ghz quad core Phenom II. A retailer near me sells the Phenom II Quad core at a 3Ghz clock speed. Would that mean that I could add another 33% to the benchmarks for AMD and say that it is a better choice than the i7?
I can't wait until AMD blows Intel out of the water as far as multithreading with their release of the 12 core processor I read about last year.
11 Jan 2009 ~ 6:50pm primesuspect Xtremesystems had a party at CES that we sadly had to miss (well, Fatcat and Pseudonym made it), but anyways - they hit 6.4ghz last I heard. Liquid helium.
11 Jan 2009 ~ 7:14pm BuddyJ They say you can't polish a turd ... but apparently if you cool it well enough, you can overclock it enough to blow the competition away. I'm all for the Phenom II.
11 Jan 2009 ~ 7:33pm Snarkasm Liquid helium? High rollers.
11 Jan 2009 ~ 7:51pm Thrax It doesn't work? Make it colder.
11 Jan 2009 ~ 10:56pm Komete That is true untill you factor in what you pay for performance. For the next 6 months to get into a core I7 setup will cost you about 700. 300 for the chip, 200+ for the mobo ( the lowest priced now), and around another 200 for memory. And that'll get you the low end offerings of I7. And as along as the q series quad cores are around, I don't see intel dropping the prices anytime soon.

To get into the best of Phenom2, which by no means is a slouch, will be less than 400. 200 for the chip, 100 for the mobo, and 50 or so for the memory. The prices on the Phenom 2's will drop, making it even better deal a little later on.

Grant it, I didn't include harddrives etc... But for the average shmo, and that includes me, core I7 is unattainable. However, I can get close to I7 performance, and even beat some of the lower offerings be going with the best of the Phenom 2 at nearly half the cost.

If I go quad core, I really don't see an option other than phenom 2. There are the q cpu's series but all the worth wile motherboards are around 200. Killing the deal for me.

Thrax wrote:

Unfortunately not. The Core i7 is simply a superior chip in virtually every regard. AMD has improved their standings with the Phenom II, but as the conclusion notes it's a feat that is a day late and a dollar short.

By the time AMD releases a 12 core chip, Intel will be well on their way to 8 core chips with hyperthreading to support 16 threads at a time. Anyone who wants AMD to succeed must wait for the Bulldozer in 2010.
11 Jan 2009 ~ 11:04pm Thrax All the worthwhile motherboards are around $200? Hardly. The DFI BloodIron is an exceptional motherboard and hovers around $100. Even the world's best boards from DFI aren't much more than $140.
11 Jan 2009 ~ 11:05pm Leonardo

they hit 6.4ghz last I heard. Liquid helium

You can strap a parachute on a pig, pitch it out an airplane, and then say it flies. Intel or AMD, I find the liquid nitrogen/helium/fartgas demonstrations to be completely useless apart from entertainment. So what!!

Komete, you can get a Q6600/motherboard combo EASILY for about $250 that will keep up with a Phenom II combo. Look, AMD is starting to go forward again (thank Heavens!), but they've merely transitioned from big disappointment, to yawn, to 'OK' we aren't crippled anymore.

No, I'm not a Fanboy of any stupid brand or manufacturer. They are all just corporations, differing mainly in the letters that spell out their names. I'd buy Via if they had top performance at good prices. (AMD is Formula 1 and Rock 'n Roll compared to humble VIA.)
11 Jan 2009 ~ 11:44pm Komete You guys are both right. When you factor in the Q series quad cores there are some deals to be had. I've been mulling over what's out there. For me, if I were to go with a quad, it have to be a p45 motherboard. And looking at what's available, the prices start at around 150 for what I would accept. Pairing a quad core with a 3 generation old chip set just doesn't seem right to me.

All that aside, Most likely my next pc will a highly overclocked e5200. Even my intel hating self can't pass that one up. That and the aps I use benefit more from a higher clock speeds than multi cores.

Leonardo, I think the Fanboy stuff is nearly over. But I still wear my AMD opteron T-shirt every now and then.lol

Thrax wrote:

All the worthwhile motherboards are around $200? Hardly. The DFI BloodIron is an exceptional motherboard and hovers around $100. Even the world's best boards from DFI aren't much more than $140.

Leonardo wrote:

You can strap a parachute on a pig, pitch it out an airplane, and then say it flies. Intel or AMD, I find the liquid nitrogen/helium/fartgas demonstrations to be completely useless apart from entertainment. So what!!

Komete, you can get a Q6600/motherboard combo EASILY for about $250 that will keep up with a Phenom II combo. Look, AMD is starting to go forward again (thank Heavens!), but they've merely transitioned from big disappointment, to yawn, to 'OK' we aren't crippled anymore.

No, I'm not a Fanboy of any stupid brand or manufacturer. They are all just corporations, differing mainly in the letters that spell out their names. I'd buy Via if they had top performance at good prices. (AMD is Formula 1 and Rock 'n Roll compared to humble VIA.)
11 Jan 2009 ~ 11:53pm fatcat

primesuspect wrote:

Xtremesystems had a party at CES that we sadly had to miss (well, Fatcat and Pseudonym made it), but anyways - they hit 6.4ghz last I heard. Liquid helium.

Ok lets get some facts out about the PhenomII at the Xtremesystems party.

It was on liquid helium. They got WCPUID of 6.5ghz. The were able to do 3DMark05 @ 6.3ghz with 2 cores lower clocked to 6.0ghz and running @ -240c (thats not a typo)

The best we saw the "Sekrit i7 975" that intel was using was 5.3ghz on LN2.
12 Jan 2009 ~ 12:02am primesuspect They broke the world record for 3Dmark05, right?
12 Jan 2009 ~ 12:11am BuddyJ Extreme Liquid Rainbow Frozen Gypsy Tear cooling helps show us what a chip's limits are, and those limits translate into the performance numbers we see using mid-high end air cooling and water. We're now seeing one chip that may be slower clock-for-clock, but offers a higher performance ceiling going up against a chip that's faster out of the box but can only go so high. Which one do you pick?
12 Jan 2009 ~ 12:12am Leonardo

You guys are both right. When you factor in the Q series quad cores there are some deals to be had. I've been mulling over what's out there. For me, if I were to go with a quad, it have to be a p45 motherboard.

The hard decision is not with price/performance ratios and manufacturer selection. You can get an outstanding performing machine from a combo based on either manufacturers' current technology. The hard decision is deciding what your time horizon is and rolling the dice for the best projected 'upgradeability' path. I have no answer for that!

I'm sitting on Q6600-Socket 775 platforms. In my case, it turned out to be excellent. They are over a year old and still top performers, overclocked as they are. Were I having to pick a new platform today, ugh, I'd have to start the research all over again. A year ago, for top performance in multi-tasking the choice was obvious. Now that AMD has finally fallen out of bed and is awake, answers aren't so simple.
12 Jan 2009 ~ 12:19am fatcat

primesuspect wrote:

They broke the world record for 3Dmark05, right?

yes they set the 3DMark05 record saturday night.
16 Jan 2009 ~ 2:58am Monster Gamer Anybody looking to upgrade or just build a brand new computer, AMD's Phenom II would be the way to go IMO. In terms of cost, I wanted to go i7 but good motherboards cost more than $300 along with another $500 for the cheapest i7. That is just outrageously overpriced not to mention the ridiculously overpriced DDR3 memory kits they have out.

AMD has a winner with the new Phenom II X4's and the AM3 based versions are going to have Dual DDR2/3 memory controllers which will only certify your AM2+ motherboard's longevity and cheaply priced DDR2 memory.

I've ordered my Phenom II 940.
23 Jan 2009 ~ 2:00am Tushon I've been trying to decide between saving up and going i7 or getting a Phenom II 920/940 and this article + comments definitely made me go for AMD. Spending ~2x the money isnt worth it to me. I don't need ridiculously top of the line stuff but the Phenom II will definitely meet my needs. At least it will let me more fully utilize my PNY 9800 GTX+. Athlon 64 3500+ just isnt cutting it lol.
7 Feb 2009 ~ 1:04am Sledgehammer70 So I ran 3DMark06 at stock clocks on my new Phenom II 940 got some scores right around yours. Looks like my CPU score etched out the Q6600's but that could be for many reasons.

CPU: 4574
Score: 16452
10 Feb 2009 ~ 2:55am lee why did they have a overclocked 6600 and NOt an overclocked phenom II is ridiculous why they did this!
10 Feb 2009 ~ 8:48am Thrax It's simple. The 940 is 3.0GHz, and an overclocked Q6600 is 3.0GHz. This allows for apples/apples comparison of the Phenom II against what is currently the most prevalent quad core. It answers the question, "is it worth upgrading away from my Q6600?"