sisoft sandra 2k4 memory

entropyentropy Yah-Der-Hey (Wisconsin)
edited May 2004 in Hardware
well, i just got my new ram today, and i benched it, and it says my memory is running at 66% efficiency! i haven't had time to memtest it, but it is in dc and both sticks are detected. now, someone said somewhere that sandra takes into account your entire system....does that mean its saying the ram is only running at 66% of ddr500? idk, this is confusing now, but i'll run memtest as soon as i finish this post.

Comments

  • ThraxThrax 🐌 Austin, TX Icrontian
    edited May 2004
    66% efficiency is 2640MB/s, barely PC2700 speed.

    What was the bandwidth shown in the test?
  • entropyentropy Yah-Der-Hey (Wisconsin)
    edited May 2004
    4696 and 4644 MB/s . so it's up there...(note, this is at 3.2c speeds, but, if i select the 865pe chipset from the comparison chart, i'm still short by 200 MB/s, and that's a pc3200 speeds .... plus, i didn't clear out any and all programs, i just ran this. so, just now i ended all i could that looked endable via task manager, and ram MemMax to clear it up further, just in case (heaven forbid) that program might work for once. got the same score. one thing i did notice is that the comparison they have shows it running at cl2, while this ram is 2.5 (i tried putting it to 2, but w/o a voltage increase it killed my comp, and i'm nervous to break these in so hard so fast). i did run memtest 4 times through and didn't get any errors (running at 2.5 and at 3.2c speeds)
  • Park_7677Park_7677 Missouri Member
    edited May 2004
    It's the fact that you have Dual Channel is the reason for 66% efficiency. I don't have time to explain because I'm heading out the door but put both sticks in the same channel and rerun Sandra. Efficiency will be higher but not neccessarly bandwidth #s.

    It has to do with the fact DualDDR offers SOOO much bandwidth it's not all used with today's systems. And you're seeing about 66% used with yours. Yes, it's better than single channel but no where near DC's potential.
  • entropyentropy Yah-Der-Hey (Wisconsin)
    edited May 2004
    hm, that would make sense .... 4xddr and only 2xddr on higher fsb would come out to about 66%. but i should definitely keep them in dual channel, right? i have one in slot 1 and one in slot 3.
  • entropyentropy Yah-Der-Hey (Wisconsin)
    edited May 2004
    also, how many .x volts should i increase? i think this can handle up to 3.1 but my mobo goes to 2.8 i believe. would it be smart to just jack it up all the way, or does someone have a sweet spot they know of? i'd like to get this to run at 2 instead of 2.5, and seeing as how the ram itself is technically underclocked, seems like i have lots of room to make it work harder
  • ThraxThrax 🐌 Austin, TX Icrontian
    edited May 2004
    Your memory's clockspeed determines what voltage you need. If you're running it within default speeds, default memory voltage is fine.
  • entropyentropy Yah-Der-Hey (Wisconsin)
    edited May 2004
    hm, well i jumped it an extra .3v, set the timings to 2-4-4-10 (lowest it will go) and it still won't boot. had to take out the cmos batt for a min or so. i guess i can't get it to cl of 2 after all. not a big deal, was just hoping i could get more out of it.
  • TheBaronTheBaron Austin, TX
    edited May 2004
    you have geil memory, which means you get to keep it at the timings geil specified and ONLY the timings geil specified. they also say a vdimm of 2.7 is required
  • entropyentropy Yah-Der-Hey (Wisconsin)
    edited May 2004
    GAH! well that blows :mean: shoulda gotten xms instead
  • rykoryko new york
    edited May 2004
    I would say set it to your max of 2.8v, b/c Geil RAM likes a little extra vdimm voltage, especially if o/c'ing. Unfortunately, there isn't much head-room (in either direction) with geil RAM.

    For exaple, my geil golden dragon pc3500 is running @ ddr470 speeds with cas of 2.5,4,4,7 and 2.9v, unstable @ 2.8v. Its spd is 2.5,3,3,6, and it does that w/ 2.7v stable. My AI7 vdimm v goes to 3.2v, but it doesn't mater b/c I can't get it to run @ ddr500 speeds no matter how much voltage i give it....and my AI7 gives an alarm when i try any speed @ cas 3,4,4,8. As far as lower cas and droping it to ddr400, it will do that @ 2,3,3,5 w/ 2.8v, but unstable with 2.7v. I can also get ddr416 @ 2,3,3,6 w/ 2.8v, but unstable w/2.7v. So 2.8v-2.9v is the sweet spot for my RAM, and i suspect the same for other GEIL RAM.

    Hope some of this helps.
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