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Overclocking SD 4000+ KAB3E

post #1 of 5
Thread Starter 
I decided I had this processor long enough at stock and that it was time to pump up the power. I (mostly) followed DeathONator's "Ultimate Overclocking Guide".

Phase One
I started by setting my CPU multiplier to 8 and putting a 133/200 divider on the memory. I was able to get the FSB up to 310 at stock chipset voltage of 1.5V before it wouldn't post. Reducing to 305 let me get into Windows and passes for 4 hours of Prime 95. Memory timings at this phase were at stock of 3-3-2-8 as was the memory voltage (2.65V). HT multiplier was reduced to 4 at the beginning, and again to 3 after hitting 250.

Phase Two
FSB reduced to 250, HT multiplier raised to 3 and memory divider removed. Boots perfectly. Raised FSB up to 280 before system refused to POST. CMOS was reset and I tried 275, with no luck. After a second CMOS reset, 275 is tried again at loosest timings possible (3-7-7-15) and highest voltage (2.85V). Boots to Windows Welcome screen, but before I can even log in, I get memory errors. Reboot and lower FSB to 270, timings to 3-3-2-8 and memory voltage to 2.7V, ran Memtest86 for 1.5 hours without errors.

Phase Three
FSB reduced to 250, HT multiplier raised to 4 and CPU multiplier raised to 11. Boots perfectly. Changed CPU multiplier to 12, doesn’t post (at stock voltage of 1.45V). Vcore is raised to 1.69 (1.45 + 16.6%), boots into Windows but restarts after only two minutes. FSB is reduced to 240, boots into Windows and passes one hour test at Prime95. FSB changed to 242, vcore changed to 1.68 (1.4 + 20%), fails Prime95 after two hours. Temperature is a bit high at 50° C load. (Might try 2.9GHz at a later date with 1.71V just to see if it works.)

Phase Four
Change FSB back to 240, change vcore to 1.65 (1.45 + 8.3%), going to go for Prime95 stable as long as possible. Current stats are:

CPU Speed: 2880 MHz
CPU Multiplier: 12
CPU Voltage: 1.65V (1.45V + 8.3%)
FSB: 240 MHz
HT Multiplier: 4
Memory Speed: 480 MHz
Memory Timings: 3-3-2-8/1T
Memory Voltage: 2.7V
Chipset Voltage: 1.5V
Conroe Hellscream
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Conroe Hellscream
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post #2 of 5
Ok, you are doing everything right, however it seems that you should get more out of that stepping though with much lower vcore. There are quite a few 3700+ kab3e running around at 2.9+ @ 1.55V (limited by asus mb's). Try your 10X multi as sandiegos seem to prefer that multi, also, try lower overclocks with less voltage, and bump your vcore up slowly as needed as you slowly raise your overclock, you may just be pumping too much voltage and passing your cpu's sweetspot. Also, what are you stock load temps? Many are getting better temp numbers on stock cooling at similar overclocks. Make sure your heatsink is seated proplerly, and you may want to consider reapplying the thermal paste (preferably as5).
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post #3 of 5
can get more than 2.880 stable here either.. but i think a DFI mobo would help my casue... but i like my current oc ... it gets what i need done.
i am using 1.45 vcore btw
post #4 of 5
Thread Starter 
Thanks for the suggestions, I'll try them out when I get home.

Quote:
Originally Posted by erauman
Ok, you are doing everything right, however it seems that you should get more out of that stepping though with much lower vcore. There are quite a few 3700+ kab3e running around at 2.9+ @ 1.55V (limited by asus mb's). Try your 10X multi as sandiegos seem to prefer that multi, also, try lower overclocks with less voltage, and bump your vcore up slowly as needed as you slowly raise your overclock, you may just be pumping too much voltage and passing your cpu's sweetspot. Also, what are you stock load temps? Many are getting better temp numbers on stock cooling at similar overclocks. Make sure your heatsink is seated proplerly, and you may want to consider reapplying the thermal paste (preferably as5).
Yeah, I found it strange that I wasn't able to get 2.9 when alot of the others were getting 3+. I'm using AS5 and stock temperatures were 30 idle and ~38 load, if I remember correctly. You think I should be getting lower temps even with 1.68 vcore? With that much voltage I thought it was normal.

Quote:
Originally Posted by ±PinK=FloYd±
can get more than 2.880 stable here either.. but i think a DFI mobo would help my casue... but i like my current oc ... it gets what i need done.
i am using 1.45 vcore btw
Me too, I'm happy with 2.88. I'll try what erauman suggested but if it still doesn't work, I'm not complaining. I got a stock FX-57 for 2/5 the price.
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post #5 of 5
At that high of a vcore , those temps are actually pretty good IMHO . It seems like alot of vcore thou , my SD core does 3003mhz with 1.60v . and ive seen many others that dont need nearly that amount for bigger oc's. Good luck! Rukkee
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