Power Supplies and OC

[Shimano]

I see alot of top overclockers using Antec Gold Series Power Supply, is there any difference in overlocking between an Antec or a Sapphire Pure bassed on enermax revolution technology ? I own one of those and i was thinking of replacing it if there will be any OC improvement with an Antec or Cougar PSU.

[Hondacity]

it depends on your load, the enermax is very good. 1250s and 1050s.....and they'll be out soon(4-16months) with the max-revo series...

if your load is less than 500w..don't worry bout power supplies...

[Shimano]

Well i own the Sapphire 1250w version. Should i worry about loads over 500w on this monster ? i was kinda worrying about the voltages since its a multi rail psu i doesn't load to much any of the rails, i was doing furmark on a asus 580 direct cu II 930gpu/4600memory and the 12v rail had 12.31 on idle and 12.30 on load using a digital multimetter on the exact rail that powered the card. I thought its kinda much. Alot of ppl recomand antec and cougar, my load is between is arround ~550W. Should a better power supply improve the oc results ? if not i will keep the sapphire for a long time since its 1250w

[Hondacity]

1. that 1250 monster is good...its a rebranded enermax 1250...but i think you already know that.
2. 10mv drop is nothing...........some power supplies like the hx1000... start @ 12.1v on load ...goes to around 11.9v .....200mv...need i say more?
3. that power is supply is single 12v rail.....with ocp for protection..the current limits is just for protection. thus multi railed(ocp)

[Shimano]

Yes i know its actualy a enermax revolution inside, well i wasn't worring about the 10mv drop, i was worrying to see 12.30v isn't that a bit high ? i mean the ideal voltages are close to 12 from waht i know its more then oviesse that i have a good power supply and i should keep it!

[Hondacity]

12.3 v is fine, your mobO vregs will take that easily

[Shimano]

Well that was the voltage messured at the 8pin pcie, they go directly into the video card, and i managed to recently burn a 580 direct cu II after only 2 hours of oc-ing it. I got my money back cause it happend in the first 3 days and now waiting to get either a matrix or msi ligninthing. I was first blaming the PSU for the high voltages

[Hondacity]

vgpu 1.2v?

what was burnt? the connector?

[Shimano]

Vga was at 1.15v, 930/4600 runing furmark, artifacts camed out restart and everytime i entered a 3d application even at stoc settings artifacs and freez come up in about 1 min. I was trying to get the max clocks on the gpu, it was outside the case on a bench table with the fan at 100% it just died i coudn't run any 3d application for more than 1 min.

[Hondacity]

the artifacts arent because of 12.3v....vgpu and vmem are all regulated....

[Shimano]

I was somehow dissapointed of the asus 580 direct cu ii, i could had got a new vga card but i actualy asked for my money back since this happend 2 days after i got the card. I will get the matrix i guess or the msi lightning but i first wanted to be sure that my psu is ok so i won't scrue up again another vga card. If you say that 12.30v is ok and there actualy no danger then i guess i just had bad luck with a bad sample of the vga card. I chcked some pictures of my PSU and u are right, the multi railing its not like the exermax version witch is real 6 rail on the pcb.

[ScottALot]

So as long as load isn't approaching rated wattage, any quality PSU will do a top job at extreme overclocking? For example, my XFX 750W is pretty high quality, but isn't going to power any multi-GPU extreme overclock... would it do about the same job powering just an extreme overclocked CPU as a high quality 1200W unit?

[Hondacity]

So as long as load isn't approaching rated wattage, any quality PSU will do a top job at extreme overclocking? For example, my XFX 750W is pretty high quality, but isn't going to power any multi-GPU extreme overclock... would it do about the same job powering just an extreme overclocked CPU as a high quality 1200W unit?

bingo!

[Shimano]

Thanks for all your advices Hondacity i now rest assured that my psu is ok and i will not changed it for a while since it has alot of power and the good quality.

[sin0822]

So as long as load isn't approaching rated wattage, any quality PSU will do a top job at extreme overclocking? For example, my XFX 750W is pretty high quality, but isn't going to power any multi-GPU extreme overclock... would it do about the same job powering just an extreme overclocked CPU as a high quality 1200W unit?

You got to worry about peaks when you are overclocking, yea maybe it fits within TDP, but when you OC TDP is all but nothing.

I measured with my wall socket, account for efficiency and losses, and figured that at 1.1v my GTX 570 reference was pulling 80 watts more than TDP at only 900/1000.

I have a XFX 650 i think they are great PSUs don't get me wrong but it can't handle my GTX 570s in SLI and my 990x OCed, that is a job for my sparkle 1kw. and when both were OCed i saw peak at 980watts from teh wall, even though this PSu can push something like 1250watts on the 12v rail. BTW its a new unit, sparkles first shot at the big top, JG rated it amazing in performance, tieing the AX1000.

[Hondacity]

You got to worry about peaks when you are overclocking, yea maybe it fits within TDP, but when you OC TDP is all but nothing.

I measured with my wall socket, account for efficiency and losses, and figured that at 1.1v my GTX 570 reference was pulling 80 watts more than TDP at only 900/1000.

I have a XFX 650 i think they are great PSUs don't get me wrong but it can't handle my GTX 570s in SLI and my 990x OCed, that is a job for my sparkle 1kw. and when both were OCed i saw peak at 980watts from teh wall, even though this PSu can push something like 1250watts on the 12v rail. BTW its a new unit, sparkles first shot at the big top, JG rated it amazing in performance, tieing the AX1000.

so you tried a 650w psu on a gt and sli'd fermi... of course it wont' work.

and you're talking bout peak power...from dc power...don't confuse the two.