2x r295 psu advice

Cottee

Cottee

Cottee

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23 Jan 2012
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Can anyone give me some help I would appreciate it, I've just purchased 2x r295 for my rig below. Can anyone recommend me a new psu for around £180 to power the two cards and my rig, thanks for any help.

Intel Core i7-4770K 3.50GHz (Haswell) Socket LGA1150 Processor
Gigabyte Z87X-UD4H Intel Z87 (Socket 1150) DDR3 ATX Motherboard
SuperFlower Leadex GOLD 1000W Fully Modular "80 Plus Gold" Power Supply
Corsair Carbide 540 High Airflow ATX Cube Case - Black
Corsair Hydro H110 280mm High Performance Liquid CPU Cooler
Samsung 120GB SSD 840 EVO SATA 6Gb/s
TeamGroup Xtreem LV 8GB (4x4GB) DDR3 PC3-21300C11 2666MHz
Seagate Barracuda 2TB 7200RPM
 
Just to be even clearer are we talking about a single R9 295X2 or two R9 295X2s?

If the latter then your 1,000W PSU may not be sufficient.

AMD Radeon R9 295X2 CrossFire Video Card Review

In our evaluation system we are using an Enermax MaxRevo 1350W PSU. This is a beefy power supply that has served us well in testing and has allowed us to use any combination of video cards, up to 4 GPUs on previous generations without issue. In fact, the max support amperage is 30 amps per 12V rail, so the ratings in terms of amps are than what AMD recommends. We had no issues with this power supply and one AMD Radeon R9 295X2 video card. However, we did have problems with two.

The problem was a simple one to diagnose, we ran out of wattage. Our 1350W was not enough to run two AMD Radeon R9 295X2 video cards in CrossFire on our overclocked system. Note that our system runs lean, we do not have an optical drive, we have only one SSD, everything on the motherboard is turned off except what we need. The two major power drains are our CPU which is an overclocked Intel Core i7 3770K at 4.8GHz and the GPUs.

The issue we ran into was that the games would start just fine, but as we got going the wattage increased on our power meter (at the wall) until it rose above 1350W and the PSU would then shutdown. We needed more wattage to make gaming work, simply put. Since we were under a very strict time scale to complete our testing, and because we did not have a spare 1500W PSU on hand nearby we made this work in another way.
Click to expand...
 
I believe in TTLs tests his PC was drawing nearly 1400W with 2 of these.
So if you can fit 2 PSUs in your case you could get a 2nd smaller one to go with the 1000W, otherwise you might want to go for a 1500W (or higher) PSU.

TTLs review also said there were issues with some games when running 2 of these cards.
 
GoogalyMoogaly said:
I believe in TTLs tests his PC was drawing nearly 1400W with 2 of these.
So if you can fit 2 PSUs in your case you could get a 2nd smaller one to go with the 1000W, otherwise you might want to go for a 1500W (or higher) PSU.

TTLs review also said there were issues with some games when running 2 of these cards.
Click to expand...

Thanks for the advice I have gone for one of these in the end, Silverstone Strider SST-ST1500 "80 Plus Silver" Modular Continour Power Supply - 1600W Peak.
 
I was trying to find info on this as well so its lucky this thread was already open. could some one clarify for me if the psu needs a +12v rail for each gpu or can you run two R9 295x2 on a single rail for example a Corsair 1500i psu, Also could some one explain the advice ocuk is giving out about your psu needing genuine 8-Pin PCI-E cables?
 
xXxsephirothxXx said:
I was trying to find info on this as well so its lucky this thread was already open. could some one clarify for me if the psu needs a +12v rail for each gpu or can you run two R9 295x2 on a single rail for example a Corsair 1500i psu, Also could some one explain the advice ocuk is giving out about your psu needing genuine 8-Pin PCI-E cables?
Click to expand...

the genuine 8 pin i take to assume no molex to 8 pin adapters. and yes you can run 2 from a single 12v rail
 
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For two 295X2s, the only two PSUs I'd consider are the EVGA 1600w or the Corsair AX1500i.

Both good choices, the Corsair is more expensive but the monitoring stuff is actually good.
 
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