Hi, i've had this problem for ages and I can't seem to fix it. Basically, my CPU runs at 1800+ even though it's a 2400+. I have a K7S5A mobo and someone else on this site said "I used to have the 2400+ on an ECS k7s5a board. I did the pin mod to get the 1.85v and flashed the bios for the oc'ing. When I was done, I was at 2.25 stable." and i'm wondering why I only get 1.5ghz when they get 2.25! I was told getting more PSU might work, so I did and it didn't help. I'm using 1.65 Voltage Rating and my multiplier is "15x" and CPU speed is 100/100 which I think is the problem but 133/133 just makes my PC reboot and reboot and reboot etc etc. Any help would be appreciated, thanks [=

You already know the answer...it's because your FSB is set to 100MHz instead of 133MHz. 15 x 100 = 1500MHz 15 x 133 = 2000MHz You need to figure out why 133MHz makes it "reboot and reboot and reboot" You don't have to do a pin mod to increase the CPU voltage...your CPU is designed to run at 2000MHZ at 1.65v! Your problem could be caused by a weak PSU, but if you didn't pay attention to the specs when replacing it, you may not have made an improvement. Simply pulling a 300 watt unit & swapping it for a 400 watt unit doesn't mean squat if the amperage on the +12v rail doesn't increase. You should have a minimum of 16A on the +12v & you should be running a "quality" PSU. An unscientific way to check is by weight. Did the new PSU weight as much as a 2 liter bottle of Coke? If you got a $20 cheapie, that may be the problem. Check the label on the side of the PSU. Another possibilty is you're running PC100 RAM instead of PC133. Did you try your settings at 133/100? Asus A7N8X-X 1800+ @ 8 x 210MHz 512MB PC3200 Asus Ti4800SE 128MB WinME/WinXP Pro

Are you absolutely positive that board will work with the 2400+? The reason bieng is that my old man had that board and he wanted to upgrade but apparently the board could only take a 2200+(I think).Not sure as my bro was handling it all. Check the manual. Tt Lanfire nf7-s v2.0 XP-m 2500@210x11 SP 97 512mb pc3200 Jou Jye 550w psu FX5600 WDCaviar 160gb sata WDCaviar 160gb sata ;~}

Thanks for the replies. The new PSU has a 17A on the +12V rating. My previous PSU was below the recommended minimum so I made sure this would be ok although it was a cheap one @ $25 but I didn't want to spend alot of money if it wasn't going to do anything =] and I am sure that a 2400+ works on this board. Also, from another forum I found out that i'm running in 'fail safe' mode (System Clock = 99.58 MHz, NOT 100 MHz". Regards, Jake.

Ok I have just found out that this is a common problem on my mobo and apparently there are 2 common fixes for AMD XP: "Why does my system works perfectly with 100/100 FSB but then will not boot when placed at 133/133 FSB? This is a very common problem with the ECS K7S5A, so far there are two known fixes for this problem but it’s still not 100%. The problem could be PSU related or overheating of the Sis 735 chipset. Others who have upgraded their PSU’s reported to have fix this problem while other reported a fix by replacing the thermal tape off the chipset heat sink with Artic Silver or even regular silicon thermal paste." I've never heard of this Arctic Silver thing but I guess it might work, seeing as the PSU didn't help, right?

Try updating to the Cheepoman or HoneyX overclocking BIOS Asus A7N8X-X 1800+ @ 8 x 210MHz 512MB PC3200 Asus Ti4800SE 128MB WinME/WinXP Pro

When your board came out some people had problems running at 133 MHz. It probably was the output from the power supply. This line of board likes 400 plus watts. I had the same setup you had and had no problems running at full speed. I upgraded to the Pro version and have been running that for over two years very stable. You might check the settings for you ram you might have the settings set too aggressive. The reason your cpu is rated at 1800 is because you have the bus speed set at 100 MHz. If you were running stable at 133 before you might need more wattage on your power supply. At any rate you may have to run your cpu at 100 MHz to keep it stable. A k7s5a can run stable at 133 if you don’t overclock your ram and don’t have too many components running for the capacity of your power supply. Except for high end games I run my system at 1800 most of the time. It keeps the temps down and I cant see much speed loss running at the slower setting. I just upgraded to a Thermaltake Silent Boost heat sink and it keeps my system at about 37C. to 41C even at full speed. I use to use a Thermaltake Volcano 9 which did the job.....but was a tad loud. The Silent Boost is pretty quiet and very efficient. Good luck ZERO244