hello,
i need some help with figuring out if i can use my power supply for crossfire. the place i bought from said yes but i only got 1 PCIe power cable delivered with it.
my power supple is : MS-TECH MS-N750-VAL-CM, 750 Watt
the GPU im using and want to buy another for crossfire usage is: HD7870
any info about if its possible or not or maybe a different PSU (which i rather avoid if possible) would be much appreciated
Well you fucked yourself over if that psu is not 80 plus. It claims itself to be 750w but i bet it will blow up at 450. Get something like cx750m from corsair. With that you can run 3 of these
Yes I agree with MLGmatt, they don't say how it was rated or at what temp. That PSU has two 12 V rails, each 19 Amps. I don't think one rail (228 W) will do for both the CPU plus 1 GPU (100 W plus 120 W sustained). You are at full load on one rail and that PSU will shut down.
The PSU is OK for 1 GPU.
There is no efficiency given in the specs... that is a bad sign.
http://www.ms-tech.de/de/datenblatt/MS-N750VAL-CM.pdf
thank you both for your kind replies and helpfull info.
ive decided to get rid of it as soon as i can.
also i found 2 interesting psu, will this be any good?
EVGA NEX750GR, 750 Watt
be quiet! POWER ZONE 850W
the first one was recommended by a retailer. but i rather have more opinions :)
anyone that can give me some insight of which of the 2 is better? or maybe non with a 3rd option :)
well as long as the psu is 80 plus it is fine my recomendation:
Newegg- http://www.newegg.com/Product/Product.aspx?Item=N82E16817139051 you can have 3 7870's with that psu
For two 7870s that's around 340 W total including CPU. I would double it so 650 W minimum.
Second, the more power you use the more important efficiency is. I would look for Gold or better efficiency. I can recommend Seasonic G series because it was reviewed well on jonnyguru.com, or a Gold-rated Corsair (HX?) would also be good (not CX). I have the CX500M and it's fine, but for high power I think it's better to get a higher quality unit.