Memory affected by overclock

[Frippy]

I currently have an Asus AN8 SLI SE motherboard and am running the X2 3800 939 chip at 280FSB. This gives me a clock speed of 2.8gig but means my 3200DDR will only work at 266 and not 400, it is Kingston branded (2x1gig sticks). At standard clock speeds it runs at 400mhz, even locking the 66/33 bus speeds and changing memory from auto to 400 will result in a blue screen at 280 FSB, same goes for 333.

I have knocked the HT multiplier down to x4 as well. I am loathed to put more volts through the ram, do I need better quality ram to obtain a 400mhz ram speed at a 280 FSB? or am I overclocking too much?

Thanks.

 

[HangTime]

Bear in mind that on many A64 boards' BIOS, the so-called "400mhz" memory speed doesn't actually mean that at all. It simply means FSB/200*400. So if you are running 280mhz FSB, that translates to a memory speed of 560mhz (~PC4500).

The reason 333 won't work either is because that's 280/200*333 = 466mhz (PC3700)

Running your RAM at "266" in this case actually means 280/200*266 = 372mhz

Ideally you want to find something in between 266 and 333

 

[Cob]

Yip leave it on 266 and try to tighten your timings.

The 939's don't need high memory mhz.

 

[Frippy]

Thanks for clearing that up folks!