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Poor results overclocking XP-M 2500+

V

Varun

Golden Member
I'm hoping for some advice regarding my recent attempts overclocking my new 2500 Mobile. Everything I read told me that this is a pretty much guarantee at 3200+ speeds.

Well I have an Abit NF7-S v2, and some Kingston Value Select PC3200 so I figured I was all set. I plugged in the 2500+ and ran it at 166x11 to get Windows installed. I ran Prime 95 at this speed error free overnight.

I've been running it at 166x11 for a week or two, and I figured it was time to crank it up to 200x11.

Well it boots fine, gets to Windows fine at 1.65 Volts. I ran Prime 95 and I got an error after 5 minutes.

Well I can't imagine it being the RAM since it is supposed to be PC3200 so I put the CPU voltage to 1.6725V. This time I got 9 minutes before an error in Prime 95.

I cranked the voltage up to 1.7V and was able to get a whopping 13 minutes out of Prime 95.

I'm not sure if it is a CPU issue or not, as everyone has praised these for their overclocking potential. Let me give some more information.

Abit NF7-S v2
AMD Athlon XP-M 2500+
Thermaltake Silentboost
Antec Sonata with 380w PS
Kingston PC3200 RAM

Complete System Summary

Running Prime 95 my CPU got to 52C at 1.7V, which I don't consider to be too high, though I have my fan undervolted to reduce noise. If anyone thinks it is CPU heat I will put it to 12V and see what happens. I should mention here that Everest showed my CPU voltage at 1.66-1.68 even though it was set to 1.70V in the BIOS.

During Prime 95 my Northbridge got to 39C, likely due to the craptastic fan that Abit put on it along with not much airflow through the Sonata. Does this seem too high? I was planning on purchasing a Zalman NB47J Heatsink as well as another 120mm fan for the intake of the Sonata.

I can increase the RAM voltage too, but the PC3200 should run at 200MHz I would think.

If anyone has any suggestions please let me know.
 
Im running a Tbred 2600+ @ 12.5 x 186 = 2326mhz v.core 1.7v the highest its been under full load is 53c and its still stable. I also have the same case so i dont think its a heat issue. Is the multiplyer unlocked on the mobile chips? Have you tried a lower fsb and a higher multiplyer?
 
My Mobile Barton 2500+ couldnt push past 2.4 Ghz at 1.8V actual on my NF7-S Rev 2.0.
 
Your temps are a little high for OC'ing. I would suggest a 120 mm case fan, maybe a Panasonic Medium speed unit on a controller if you worry about noise. The issue is that high OC and silence with air cooling are often mutually exclusive.

I need 1.675 in BIOS to stabilize my 2440+ M, at 200 x 11 with tight RAM timings. I need 1.75 in BIOS to stabilize at 200 x 12, 1.85 to stabilize at 200 x 12.5 and 1.9 (and lots of noisy fans) for 200 x 13. I can run at 200 x 13.5, but cannot likely stabilize it (never really tried). It runs at close to 62 C. and the fan noise is unreal..............

Also, the PSU can begin to cause issues when OC'ing. That particular PSU is likely fine at default everything, but when pushed it isn't likely to have a very happy (or long) life. Watch the voltages. If they are strained, it's time to upgrade. PSU's can let go without any warning, and normally take out other items with them.
 
the nf7-s undervolts the cpu by 0.025 volts, prime95 shouldn't be failing from heat at 52, i've successfully passes prime in the high 50's, i need 1.775 volts to pass at 2.2, 1.875 to pass at 2.5, 1.925 to pass at 2.65, you can look into getting the tictac modded bios, at the very least, all the important settings are on the first page (mem timing, voltages, cpu multiplier, fsb)
 
i have a xp-2500m as well.. to get to 12x197, i have to get put it at vcore = 1.8v

as long as cpu temp doesn't go over 65C+ i wouldn't worry too much
 
It could also be your memory ... my asus a7n8x dlx rev2 was sensitive in that regard (i.e. worked great at 198, would fail prime at 200 within mins). Try backing down a little on fsb (e.g. 11x198), and boost your vdimm to 2.7v. My mobile 2500+ would do 198x12 stably at 1.65v actual, so you cpu volts should be fine (I only needed 1.7v for 198x12.5).
 
Put it at 11 x 200. vcore at 1.65v s/b enough.

IMHO, you should memtest86 b4 P95. Let it run overnight. Your cpu & mobo s/h have no problem @ 200 FSB.

Try voltage to ram at 2.7

Fern
 
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