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PC6400 Patriot Viper 2x2GB 800mhz questions

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Last response: in Memory
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January 2, 2009 3:39:26 AM

I am running this memory on my xfx 680i mobo with a q6700. My cpu (Q6700) is oc'd to 3.33ghz - i have kept the modules clocked at 800 - but i noticed in the bios that the timings (which were set to auto) were 5-5-5-12. the timings are supposed to be 4-4-4-12. I have the timings set manually, and voltage set to 2.2 and havent had any problems thus far - but was just curious if anyone else has had this problem

Also, my memory bandwidth is usually around 5000 mb/s - is this the most i should expect from this ram on this mobo using the q6700?

Thanks in advance

Edit: Does anyone have any experience overclocking these modules? what were your results
January 2, 2009 4:40:15 AM

The 5-5-5-xx timing is a default timing setting. 4-4-4-12 is technically factory overclocked memory according to the agreed upon memory standard.

As for the memory bandwidth, which program did you use? Some test burst read/write rates while others test sustained read/write rates. Either way 5000 is a bit low. NVidia motherboards are meant to offer superior memory performance (if they are to be believed) and my 800mhz 5-5-5-15 are doing 6400mb/s sustained
January 2, 2009 4:48:21 AM

i was testing with winsat mem -v in cmd
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January 2, 2009 6:11:46 AM

i was using 4 modules, i removed 2 modules and ran it at 1T, my bandwidth improved to 5400 mb/s
Is this a limit of the 680i chipset?
January 2, 2009 6:25:57 AM

Back when I had a 680 with some 1066mhz I was hitting 8500mb/s in SisSoft Sandra which tests sustained speeds so I wouldn't say so.
January 2, 2009 6:27:38 AM

hmm, maybe it could just be a fault with windows system assessment tool?
January 2, 2009 6:34:41 AM

Quite possible, please try a more recognized tool such as SisSoft Sandra or Everest.
January 2, 2009 5:15:10 PM

in sisoft sandra i got a sustained bandwidth of 6710 MB/s
January 2, 2009 8:10:37 PM

Apparently these modules dont like to run at 2.2v 4-4-4-12 1T

set it back to 2T with voltage set to auto - lost a tiny bit of performance but its stable again :( 

I am not impressed with this ram. Low timings but pain in the ass to OC

hope this helps someone in the future
January 5, 2009 3:11:40 AM

Er... T1 CL4 at 800mhz?! No freaking wonder the ram is unstable...

T1 isn't meant for as high speeds as T2. That performance loss is minor. PC6400 is only meant to do 6400MB/s. Try pushing up your mhz instead and possibly loosening your timing to 5-5-5-15 to avoid pushing your memory volts up to high.
January 5, 2009 8:03:19 AM

i tried relaxing the timings like you said. and pushing up the mhz - the performance gain was negligible

then, i kept the 5-5-5-15 timings and went back to T1 - nice performance boost and stable thus far. going to do memtest soon
!