LanParty Pro875B 5:4 divider O/C problem

[Mikeyflan]

I have a LanParty Pro875B Rev. A mobo I o/c it already w/ 2.4C @ 3.32 (277FSB) and voltage is default. I have my vdimm at 2.7. I got it up to 285 but was unstable even tried vdimm at 2.8 also raising cpu voltage and it was unable to, so then I started over went back to stock setting then tried a 5:4 divider with a 203fsb and it would't post. Anything else I can do? or maybe recommend bios I should try and flash to.

 

[JohnAn2112]

Your PC won't post with a 5:4 divider at 203 FSB? You mean your RAM was only at 162 and it didn't post? Does it still post at 1:1 at 200 FSB? Your RAM is rated for 275 and it's really hard to get up higher than that. You said you got up to 277 FSB on stock voltage on your CPU and that's really good to begin with. How high can you get with 2.8 vdimm?

 

[Mikeyflan]

Yea it post with a 1:1 divider crazy huh. with 2.8 vdimm I got it up to 3.4 but it crashed in 3Dmark03 and 05 close to the end of the benchmark. I asked DFI what bios they recommend but no answer yet.

 

[JohnAn2112]

You might just be hitting your limit. What you have is pretty damn good. The only other board I know off the top of my head that *might* to better is the Asus P4C800 and even then, you'd probably hit a wall at about 285 FSB.

 

[Mikeyflan]

Well at least I got the ram running at its rated speed. but I'm going to play with it later see what happens.

 

[Mikeyflan]

I just noticed that I had spread spectum and auto detect pci clk enabled so I disabled them, I got the same results but my system became more stable and I was able to get further in the 3dmark benchmarks. Also noticed while using cpuz that my cpu voltage was jumping up and down like with the 1.520 voltage when o/c it would drop to 1.488 even when I raised the voltage it droped so I'm going to get a new PSU maybe get an Antec True480 or the Antec NeoPower, see what happens.