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Issue overclocking memory 680m sli

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Hey guys

I have an Alienware M18x r2 and I'm having an issue overclocking the memory past 400mhz using Msi Afterburner. I'm using svl7s 1.05ov vbios. My machine spec is:

3940xm cpu - triple pipe neatsink

Dell 680m sli

16gb ram 1600mhz

Evo 840 pro 250gb

Stock 330w power brick

Has anyone else had the same issue overclocking the memory? My understanding is you can overclock past 400mhz on the memory with stock vbios. Is this correct?

Any help would be greatly appreciated.

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You're trying to push the frequency 400MHz above the default clocks and seriously wonder why you're having issues?

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It was 400mhz in afterburner so 200mhz actual. I've seen that others are able to set higher than 400mhz in afterburner so wondered if I had an issue with the cards.

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If anyone reads this: After a few days of testing, and flashing different ov vbios, it seems that these cards just don't overclock as high as my previous cards. I got 2 new 680m under Dell warranty.

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680M memory chips quality is not flat line unfortunately- mine went up to 600MHz in the afterburner but mine friend's one reaches 450 at the very most. Do check the thermalpads on the chips, that may help to some extent

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