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I've recently picked up a Coolermaster HAF with an ASUS p8p67pro motherboard equipped with 8 gigs of ram while running on Windows 7. This thing is hardly a month old, and yet it runs like an old dog with hip dysplasia.

I've downloaded the DPC Latency Checker V1.3.0 to help me find the root of the problem, yet to no avail. I've disabled basically every driver that I've deemed unecessary, and it's not like I've got too many programs installed since this thing is about a month old.

At times, the Latency is in the red zone all the way across the screen, thus making it impossible to accomplish anything. I'm a 3D artist, so I'm used to computer slow downs while working with large files, but the CPU slows down even while idle.

The problem is sporatic - sometimes really bad, sometimes super bad, to not so bad to no problem at all (though very rarely) -- making it harder to diagnose the problem.

Here's the hardware:

  • Box: Coolermaster HAF 922
  • Motherboard: ASUS P8P67 PRO
  • CPU: LGA1155 socket for intel 2nd generation core / 3 processors
  • Graphics: Nvidia Quadro 4000 + Nvidia gtx 560
  • Network: ASUS PCE- N13 802.11b/g/n Wireless adapter
  • Audio: Realtex ALC 892

The two Nvidia graphics cards are not SLI compatible (the Quadro being a Workstation card), but I have them hooked up to separate monitors and they seem to work fine. Could that be part of the problem?

Needless to say, this is driving me mad. Any help / advice would be awesome.

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Are your temperatures okay? Did you manually set your RAM latency? – Breakthrough Jun 24 '11 at 18:11
There's a program which can actually show which drivers are biggest culprits for latency problems, but I can't remember its name. I think that it's part of the sysinternals package, so you can try checking there. – AndrejaKo Jun 24 '11 at 18:42
@AndrejaKo - Maybe not what you were thinking of, but try LatencyMon: – Shinrai Jul 1 '11 at 17:41
@Shinrai Actually, it was exactly what I was thinking off. It's just that my memory isn't what it used to be. – AndrejaKo Jul 1 '11 at 19:19

DPC latency is usually caused by a bad driver (or a bad device itself). You say you've tried disabling some, but try disabling every single component that you can and see if it goes away, then reenable one a time until you find your culprit. This could also be a virtual hardware driver installed by any apps.

In my experience, wireless adapters are NOTORIOUS for doing this, so I'd start there.

You might also use LatencyMon rather than DPC Latency Checker - it can be more specific as to what's making the calls.

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