with an x2 3800+, you should be able to get to 2.4 on stock 1.35-1.4v... 2.5GHz with a .25v increase... 2.6GHz with a .5v increase... 2.7 .75-1.00v increase... etc... either way, stay at or below 1.5v on the cpu (not advisable to higher)
but, i agree, it definetly sounds like OC configuration issues (or memory problems, possibly the motherboard, not sure)... youll need to reduce the memory speed from 200 to 166, 133, or 100 (depending on the OC increase), adjust memory timings too, in order to OC the cpu by much in most cases, definetly incase your memory doesnt OC well (because it OCs by the same amount your cpu does)... also reducing the htt multiplier to 3x is necessary above 2.4, (reducing to 4x at up to 2.4GHz from 2.0GHz)
you also might need to increase the memory voltage some when you get high enough
yeah... in that case, i would first relax the timings, to 3-3-3-6 see if that helps at all (or more, if needed)... second, reduce the memory speed from 200MHz, down to 166MHz... see how much that helps
if you can get a noticable OC, try tighting the memory timings some again, until its unstable again, then back them off some
This mobo has so many adjustements, i d'ont know where to begin, ie:
ddr memory frequency
dram cmd-addr timing
north bridge voltage etc....
which ones can or should be changed? I fooled around before and had to reset the cmos jumper as it would no longer boot.
Hope you guys can help me with safe settings...
ddr memory frequency is the clock speed of the chip, so you want to take that down from ddr400 (200mhz) down to ddr333 (166mhz) (when OCing up to 2.4, HTT multiplier 4x), ddr266 (133mhz) when OCing much more than 2.4, up to about 2.6-2.7 (HTT multiplier 3x)... going down to ddr200 (100mhz) would really only be necessary if youre OCing to 2.8 or above (i would think anyhow)
you should be able to get to at least ~2.6 (2.5 to 2.7, either way)
(first number) CAS latency should be changed from 2, to 2.5, or even 3
(second number) tRCD should be set to 3, 4, 5 etc (higher is slower)
(third number) tRP should be set to 3, 4, 5 etc (higher is slower)
(fourth number) tRAS, not important to change really, its 5, more couldnt hurt, not too necessary to change, maybe 6, 7, or 8 if you wanted to
dram cmd-addr timing should be adjusted to 2T, 1T is faster, but again, 2T might be necessary to get a higher OC (if you can do 1T while also having an OC, all the better)
memory voltage is the only other one thats significant when you get high enough in clock speed, it wont need to be adjusted right away, and not for at least a few hundred mhz cpu increase either way
the other settings dont matter too much, TBH... and, im not sure about a lot of them myself (someone else can probably clear that up better)... the north bridge voltage is the only one im wondering about, but i wouldnt increase it unless you really needed to (should find out)
but when you reach a high enough clock speed, you can try tightening settings again, to see whats the most stable, while offering the best performance
beyond that, youll want to check for stability with a program like orthos, to see if the OC you have is stable, leave it running for at least 10 minutes, longer is better, try to stay at or below ~60C cpu temperature (too much higher and you will have instabilities)
the best way to get a really good o.c with a 939 is to get a dfi board. i went from 2.4 max o.c on the same msi board as yours to 2.9 on a dfi lan party sli-dr. they are very cheap to buy now. but at that point you should just buy a 6300-6400 and cheap 965 board and it would kill that opty.