ATI 5970 running stock clocks. I attempted to install both the ATI 5970 & my GTX 295 to get some Physics action going, but my 1000Watt PSU isn't up to par to make that happen.
Who in their right mind would have ever thought 1000 Watt PSU would not be enough? I knew overall it wouldn't power it but I couldn't resist trying. But if it did work that would have been bad ass.
If you mean 2 cables directly out of the PSU per card coming from different rails than yes. The problem is the ATI card card need 450+ Watts & the GTX295 needs about the same to really run.
When trying to boot with both cards the mobo pops a power error "75" on the DFI board. But the error pertains to a Hard drive / SATA power error and not an error with the GPU.
It is a modular PSU.. each PCI-E plug has its own dedicated plug. Each plug is based upon a different 12v rail. in turn each card has a dedicated rail for power. In other news... I bumped up the OC on my system and on the GPU and got lower scores?
CPU was 4.1GHz & is now 4.22GHz
GPU was 825MHz & is now 840MHz
GPU mem Clock was 1100MHz is now 1175MHz
Score was 22579 is now 22044
In looking at the break down The CPU score went up while the GPU score went down.
GPU Test 1: 65.24 - Now - 62.66 GPU Test 2: 62.50 - Now - 60.13
CPU Test 1: 3562.29 - Now - 3690.11 CPU Test 2: 31.72 - Now - 32.43
It looks like you're using one modular and one hardwired pci-e cable on each card. Try using both hardwired on one card and 2 modular on the other and see if it works.
The hardwired pci-e cables are on the 12v1 rail and the modular are on the 12v2 rail.
That new OC might be too much for your card to handle so it's throttling something to prevent damage or it's not able to run that fast with the current voltage.
So I put the GTX 295 back in with the ATI card and setup the power cables as noted above and the system is doing the same thing. Goes into bios screen and loads like it is going to get into windows & than resets and just loops around the bios load screen. I can access the bios etc.. but the system will not boot.
If I unplug the power from the Nvidia card the system boots just fine.
Definitely sounds like a power problem. Keep in mind, your current configuration has 4 GPU cores plugged in when your GTX 295 is connected, and NVIDIA cards are not known for going easy on power supplies.
I'm not so sure it's a power problem. With both cards under load it would really push the PSU hard but from a cold boot would they be drawing enough power to not boot into windows?
I am pretty sure full power is pushed during boot. Hence why most times when you start your PC all items/fans are running at full speed than drop down to idling speeds.
It isn't quite maximum load, but during the BIOS POST phase, all power saving features of a PC are inactive. The CPU runs at maximum clock speed, so do the graphics cards, and all other power management techniques (such as selective USB shutdown, PCI express link state management, etc) are inactive.
I'd be surprised if it constitutes full load draw, because technically the hardware isn't being made to work, but power management generally doesn't kick in until Windows drivers get loaded up.
Its all good. I ordered a new PSU for my buddies system... when it arrives I am going to barrow it for a day and use it as a dedicated power supply for one of the cards.
High-performance computers have to make me stop and think, though... How long is it going to be before you need more than a 15A circuit to run one? You're already pushing the envelope with draw exceeding 1000 watts.
No I am just a enthusiast who's hobby is trying new things & buying new hardware for his PC... everyone has a hobby mine is to spend money for 15% performance gains - lol
Comments
HD5850 rendering + GTX 285 running interference (PhysX).
I give you your moment of zen.
Who in their right mind would have ever thought 1000 Watt PSU would not be enough? I knew overall it wouldn't power it but I couldn't resist trying. But if it did work that would have been bad ass.
When trying to boot with both cards the mobo pops a power error "75" on the DFI board. But the error pertains to a Hard drive / SATA power error and not an error with the GPU.
Brand: CORSAIR
Model: CMPSU-1000HX
Type: ATX12V 2.2 / EPS12V 2.91
Maximum Power: 1000W
Fans: 140mm Thermally Controlled
PFC: Active
Main Connector: 20+4Pin
+12V Rails: 2
PCI-Express Connector: 6 x 6+2-Pin
SATA Power Connector: 10
SLI Ready
CrossFire Ready
Modular: Yes
Efficiency > 80%
Energy-Efficient: 80 PLUS Certified
Input Current: 13A
Output: +3.3V@30A, +5V30A, +12V1@40A,
+12V2@40A -12V@0.8A, +5VSB@3.5A
MTBF: >100,000 Hours
Approvals: UL, CE, CB, TUV, FCC, CCC
Dimensions: 150mm(W) x 86mm(H) x 200mm(L)
CPU was 4.1GHz & is now 4.22GHz
GPU was 825MHz & is now 840MHz
GPU mem Clock was 1100MHz is now 1175MHz
Score was 22579 is now 22044
In looking at the break down The CPU score went up while the GPU score went down.
GPU Test 1: 65.24 - Now - 62.66
GPU Test 2: 62.50 - Now - 60.13
CPU Test 1: 3562.29 - Now - 3690.11
CPU Test 2: 31.72 - Now - 32.43
The hardwired pci-e cables are on the 12v1 rail and the modular are on the 12v2 rail.
If I unplug the power from the Nvidia card the system boots just fine.
I'd be surprised if it constitutes full load draw, because technically the hardware isn't being made to work, but power management generally doesn't kick in until Windows drivers get loaded up.
High-performance computers have to make me stop and think, though... How long is it going to be before you need more than a 15A circuit to run one? You're already pushing the envelope with draw exceeding 1000 watts.
3.8GHz
stock clock on GPUs
CPU: 87649
GPU: 21534
http://service.futuremark.com/compare?3dmv=2116957
CPU 4.5GHz
GPU: 904/2128/1808
Well my GTX 480 isn't the only thing new in my system
Temps: Idle 35c - max load 46c
Performance Mode w/ PhysX
Overall: 44,203
GPU: 37,786
CPU: 90,123
Link: http://service.futuremark.com/compare?3dmv=2150895
Performance Mode without PhysX
Overall: 38,884
GPU: 37,886
CPU: 42,051
Link: http://service.futuremark.com/compare?3dmv=215091