2600 Mobile, NF-7S and 200mhz (or lack of 200mhz fsb)

[RedWolf]

I've got a mobile athlon xp 2600 that I can't get 200mhz fsb on while overclocking. I can get to 2.4 at 166mhz fsb but if I try to set it to 200 I cant get over 1700mhz. I've set the ram to run at 6-3 and overclocked the cpu to 1.8. Still can't get above 1700 at 200mhz. When running at 166 and 2400, I can drop the voltage to 1.625. I've checked my temps and they are below 40.

One other thing is that when I try going above 1700/200, the computer starts beeping like a siren. ANyone have any ideas?

 

[Renob]

Bump the voltage of the ram to 2.8 turn it back to 200 and lower the clock multi on the cpu to rule it out.

 

[RedWolf]

Thanks for the suggestion. I dropped the multiplier to 7.5 and jumped to 200mhz and 2.8 voltage for the ram. No problem. I got it up to 220 before I stopped. I was not able to complete more than 3 runs of sandra's memory burn in tests at 220 (440mhz memory) but was able to boot to windows and run normal apps. I'm pretty sure the ram is ok.

I have a 420 watt enlight psu. I'm running one sata seagate hd, 1 120mm fan, 1 dvd+rw, and a Radeon 9600 NP. I wouldn't think it was lacking voltage.

Any other suggestions?

 

[muddocktor]

I would say for you to download and run memtest86 while trying to run at 200 fsb with a low multiplier (so that you rule out processor problems) and see if memtest86 shows any memory problems after the first 4 or 5 tests. Memetest86 runs in dos mode at bootup and is a lot better check of memory integrity that sandra.

One other thing, I've heard of NF7-S mobos giving problems before with the siren sound and high fsb speeds. Maybe you got a bum board.

 

[Peter D]

Is it a Rev. 2.0? If it is, then RMA it if you can't figure out the problem. It's using the Ultra 400 Chipset so 200FSB should be no problem and I would assume it would be no sweat for the CPU either..

 

[RedWolf]

I decided to try it with only one stick of ram. I got it up to 215 and a high multiplier. I believe one of the sticks was giving me problems. I had three sticks in there and should be smart enough to know that I should have done all my testing with a single stick. Thanks for all the help.

 

[howdyduty]

Nice work. Thanks for letting us know what you ended up with.