power supply and memory settings

[sendatooli]

if i try to run my fsb at 150 with the memory at its fastest settings and cl2(ddr) the machine crashes in 3 minuets. on the slower(medium) settings it works fine. i thought the power supply is holding me back from getting the fast settings at 150fsb. i figured this, because when i plugged in the delta 38cfm the machine wouldnt even load windows. the fan drew all the available power.
the rail that says +5 in mbm fluctuates between 4.95 and 5.00. everything else is at or above the specs. it is a antec 450 watt. there is a LOT of stuff in my case and two cpu's.

so i was wondering if i move up to an enermax 550 watt(expensive), will i probably get the memory on the fast settings at 150 fsb? i dont want to run out and buy a expensive psu if it isnt going to get me there!

does my current psu seem ok going down to 4.95 under load on the 5v. rail?


thank you,
sendatooli.

[Placid]

Your psu seems to be doing ok 4.95v is not bad at all.
Have you tried raising your memory voltage?

[sendatooli]

maybe its ther memory. im using two sticks. it was working with one stick. the 3.3v is also lower than 3.3v. but 4.95 on the +5v rail is ok for amd? i thought it should be over 5v? it is now crashing after a while even at slow settings. intresting thing is it crashed imediatly with the delta fan. maybe its a cooling problem. at 150fsb the cpu's run much hotter. with the 25cfm fan. at 150 fsb i get 44c. idle. and 49 c. full load. at 138 fsb i get 37c. idle and 43-44 full load.

i really want to use 150 fsb! any ideas? i was going to buy a new psu tonite. now i'm not sure if that is the problem.


thank you,
sendatooli.

[Placid]

Your cpu should not run hotter provided its at the same mhz.
Try lowering your multiplier if you can so 150xthe multiplier will equal a speed you know your cpu can run at without a problem.

[]-[itman]

You should do fine with that ps. You mentioned that when you backed the memory off to medium settings it works fine. I'm guessing this is where your problem is. What company RAM do you have? i.e. crucial/corsair/samsung? It may just be that the RAM can't go that high of speeds or isn't getting enough juice.

[eobard]

Originally posted by sendatooli
i thought it should be over 5v

My line dips to 4.85(ish) without problem. When I reconnect my volt mod I can get another 100mhz (possibly more) form the chip but the 5v line gets as low as 4.79(ish) and that causes crashes. 4.95v is beautiful, even if it's below 5.0, I'd love to have that much on my 5v line.

[!-=sky=-!]

my enermax 450walt psu is running 5v@4.7v idle and i dont have problems yet

[sendatooli]

so i guess the consensus is i do not need a different psu. thats great! i just wanted to add my +3.3 is 3.28v. is that ok too? i thought amd states the psu has to put out no less than 5v. on the +5 and 3.3v. on the + 3.3?
i will lower the multiplier now. i thought i could get 1725 mhz out of these. i guess they wont do it right now. i could increase memory voltage. also i am right now testing just one stick i know works at 150. instead of 2 sticks. i know 2 sticks can lower the possibility of hitting 150fsb.

i thought temp goes up as mhz increases? at 1662 mhz 133 fsb it runs full load at 44c. with my 25cfm fans on sk6's. at 1725 mhz with 150fsb it runs 48c. full load. strange thing is 1725mhz crashes imediatly if i use the delta fan. is the delta fan so powerfull it sucks out all the juice in my psu?


thank you,
sendatooli.

[oc jason]

no that psu has enough power for most systems, try upping meme votage, and as far as timings, can u get over 150 at the slowest settings? ALWAYS take speed over TIMINGS in any situation, youll be faster @!155 slow settings then at 150 turbo, i promise you, and with less errors. Getting 150 is a good goal, but otn take less just to get faster timings

[Gravity Man]

Originally posted by [OC] Jason
ALWAYS take speed over TIMINGS in any situation, youll be faster @!155 slow settings then at 150 turbo, i promise you, and with less errors. Getting 150 is a good goal, but otn take less just to get faster timings
I think I'm going to have to disagree with the senior on this one. I have found the exact opposite- fast timings are better than high speed.

[Hugo 59]

I too think that I am going to have to disagree with Jason on this one. I get better system performance running at cas2 then I do dropping the timings and gaining a few MHz.

My 2¢

[sendatooli]

i just found out that it isnt only the voltage your psu puts out. more importantly its the amperage on each rail! i dont really want to load it and test it with my vom. ive broken enough stuff this week! strange thing is it is not on amd's approved list but a smaller one is. i dont think we should really go by amd's list. it even says many psu's work that are not approved.
it works fine up to 146 fsb. does the psu have to do with what fsb i can reach? this one may indeed not be powerfull enough to reach 150fsb. i know people commented my voltages were ok. what about amperage?



thank you,
sendatooli.

[AstronMike]

Speaking of amperage, Ive noticed on the sides of PSUs that it lists the individual stats for each of the important rails, such as the 3.3, 5.0, and 12v. Also listed the max for all these combined.

The larger the PSU rating, the bigger these figures tend to be, but I have seen a generic 350 watter with *lower* rail stats than the Antec 300 I had. So, should we pay more attention to this info on the PSU side?:rolleyes:

[brooklN]

Just a side note on your cpu temps.

my xp 1700 was very unstable @ 50c