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Greetings all,

While I have had a thread or two on a similar issue, I did not see any I had made referencing this concern directly so here it goes.

Basically, my SR-2 system. Running great now after months and all that. OC'd it to be stable at ~3.7-3.8 Ghz nicely. One GTX 580 works wonderfully with an AXP cooler.

The problem which I've posted on EVGA's forums and elsewhere though is that it'd lock pretty quickly after I put the second 580 in. Generally it'd always lock up while playing a game and/or music with it. Occasionally it'd also lock up sitting on desktop or browsing in Windows. Thought it was the whole HD audio mess conflicting with the Realtek onboard sound so disabled all HD audio devices like that one good EVGA thread stated. Didn't *quite* solve the problem but I did think it helped rule out possibilities.

Ok so now that you're up to speed on things, here's where I'm at now.

Had a friend come over with a voltmeter today and we got to test those nifty SR-2 voltage points. Tested it with one GPU and system at idle, one GPU under full system load (CPU / GPU) and tested it with both GPUs in for system load so we could get a slew of #s to go off of.

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The good news is I think I *FINALLY* have two good GTX580s (it took 2 RMAs to make that happen alas). The bad though is we reverted my OC back to "Load Optimized Defaults" in the BIOS. We did not clear the CMOS but just reverted the OC. Had Nvidia 263.09 drivers be stable for me so simply shut down, popped second card in, connected bridge, rebooted and saw SLI and was good to go.

While I can not say if I'm fully stable for now, we did run Heaven for a good 30 minutes at DX11, extreme tessellation etc., everything maxed while playing music in the background - while FOLDING on the CPU and GPU - and it continued without a hitch (and scored a good average 60 FPS too XD). So while I will say I'm stable after only going for greater than two or three days of uptime straight while gaming and folding etc., I ran into an interesting observation...



You can see the CPU voltages drop sharply once the board is tapped under a load with two GPUs. Is this normal? What I am wondering is if my CPU OC originally was too much for a component while that second GPU was installed. Basically was hoping you guys would have an idea of what these fluctuations mean.

I was thinking basically it's either the board or PSU. When I tried folding for the times I was stable with both cards and had the CPUs OC'd at ~3.8Ghz, I was hitting 1KW+ from the wall but I would imagine if I'm hitting a hard limit on my UPS, it'd shutdown immediately. I could always move the monitor over to the non-battery backed up side but it'd be pretty strange to leave the configuration like that.

I would like to slowly re-enable an OC a few steps at a time but despite my huge amount of notes OC'ing this board originally, I kind of feel like I'm back at step #1. Was thinking, 2.4 > 3.0 > 3.25 > 3.50 and maybe stop there depending on how quickly (if at all) the system locks and hangs.

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tl:dr - Voltages are fluctuating once I add my second GPU and put the system under load. Under one GPU it's fine. Does this point to the board or PSU being bad?

Thanks for any advice and suggestions.
Edited by The-Real-Link - 3/8/11 at 9:03pm
Melchior SR-2
(15 items)
 
  
CPUMotherboardGraphicsRAM
Intel i74930K EVGA X79 Dark Nvidia GTX Titan X (Pascal) 64GB GSkill Sniper 
Hard DriveOptical DriveCoolingOS
Intel 750 Series 1.2 TB PCIe x4 NVMe SSD / 960G... LG Blu-Ray Burner / 2x LG Millenniata DVD+/-RW Corsair H80 Pump + 3 YL Medium Fans Windows 10 Pro 64-bit 
MonitorKeyboardPowerCase
Dell 27" 4K P2715Q Corsair Strafe Cherry Red MX EVGA SR-2 PSU Lian-Li PC P80 
MouseMouse Pad
Corsair Steelseries Rival 100 None 
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Melchior SR-2
(15 items)
 
  
CPUMotherboardGraphicsRAM
Intel i74930K EVGA X79 Dark Nvidia GTX Titan X (Pascal) 64GB GSkill Sniper 
Hard DriveOptical DriveCoolingOS
Intel 750 Series 1.2 TB PCIe x4 NVMe SSD / 960G... LG Blu-Ray Burner / 2x LG Millenniata DVD+/-RW Corsair H80 Pump + 3 YL Medium Fans Windows 10 Pro 64-bit 
MonitorKeyboardPowerCase
Dell 27" 4K P2715Q Corsair Strafe Cherry Red MX EVGA SR-2 PSU Lian-Li PC P80 
MouseMouse Pad
Corsair Steelseries Rival 100 None 
  hide details  
Reply