Hey Guys,
I come to you in a last ditch attempt to troubleshoot a problem I'm having with my two 9800gt in SLI.
It seems I'm getting a 40-50% decrease in benchmark/game performance when I'm running these two cards in SLI compared to a single card. It's quite confusing as both of these cards run an OCCT benchmark at around 170FPS independently but when I enable SLI in the Nvidia control panel the performance drops to around 90FPS. Which indicates that each card by itself is fully functioning and the problem lies with the SLI
At first I thought this may be a power issue as both cards were OC'd along with my CPU and may be drawing more power than my not-so-great PSU can output but this problem persists at stock/underclocked speeds. I've read mixed power requirements for these cards from numerous websites. I'm under the impression at least that they require about 35W-116W each according to: http://archive.atomicmpc.com.au/forums.asp?s=2&c=7&t=9354 give or take a few.
My specs are;
Mobo - MSI K9N SLI Plat
CPU - AMD Athlon 64 X2 5000+ @ 3.1
GPU - Both EVGA 9800GT 512MB (Slightly different BIOS and PCB but I read this wouldn't be a problem)
RAM - DDR2 800 4GB
PSU - Jeantech JN120F-600AP12V2 (3.3@32A, 5@60A(330w Combined), 12.1@19A, 12.2@19A(440w Combined) 575w max 2xPCI-E oulets
OS - MS Windows 7 Ultimate 64-bit 7600/Ubuntu 11.10
Nvidia Driver - Latest 285.62
ForceWare version: 285.62
(Yes, I need a major upgrade, I know)
So my question is Do I need a new PSU? A new card? Or anything you feel is incompatible with my current setup? Would there be a bottleneck that would cause this specifically(PCI-E lanes maybe?)
I'm inclined to think it's the PSU as both cards work fine independently even OC'd! I thought that maybe 19A on the rail was a little low for SLI although I did swap out my pci-e power cable for one of those 2x4-pin molex to PCI adapters but it posted the same result - Fine by itself, crap in SLI.
Any insight or suggestion would be greatly appreciated as I'm totally stumped when it comes to this. TIA
I come to you in a last ditch attempt to troubleshoot a problem I'm having with my two 9800gt in SLI.
It seems I'm getting a 40-50% decrease in benchmark/game performance when I'm running these two cards in SLI compared to a single card. It's quite confusing as both of these cards run an OCCT benchmark at around 170FPS independently but when I enable SLI in the Nvidia control panel the performance drops to around 90FPS. Which indicates that each card by itself is fully functioning and the problem lies with the SLI
At first I thought this may be a power issue as both cards were OC'd along with my CPU and may be drawing more power than my not-so-great PSU can output but this problem persists at stock/underclocked speeds. I've read mixed power requirements for these cards from numerous websites. I'm under the impression at least that they require about 35W-116W each according to: http://archive.atomicmpc.com.au/forums.asp?s=2&c=7&t=9354 give or take a few.
My specs are;
Mobo - MSI K9N SLI Plat
CPU - AMD Athlon 64 X2 5000+ @ 3.1
GPU - Both EVGA 9800GT 512MB (Slightly different BIOS and PCB but I read this wouldn't be a problem)
RAM - DDR2 800 4GB
PSU - Jeantech JN120F-600AP12V2 (3.3@32A, 5@60A(330w Combined), 12.1@19A, 12.2@19A(440w Combined) 575w max 2xPCI-E oulets
OS - MS Windows 7 Ultimate 64-bit 7600/Ubuntu 11.10
Nvidia Driver - Latest 285.62
ForceWare version: 285.62
(Yes, I need a major upgrade, I know)
So my question is Do I need a new PSU? A new card? Or anything you feel is incompatible with my current setup? Would there be a bottleneck that would cause this specifically(PCI-E lanes maybe?)
I'm inclined to think it's the PSU as both cards work fine independently even OC'd! I thought that maybe 19A on the rail was a little low for SLI although I did swap out my pci-e power cable for one of those 2x4-pin molex to PCI adapters but it posted the same result - Fine by itself, crap in SLI.
Any insight or suggestion would be greatly appreciated as I'm totally stumped when it comes to this. TIA