how can i tell if my psu can handle crossfire

Kaitlin Kaschak459 · Jul 27, 2014

hello my friend wants to give me his old HD4890 gpu since he bought a new one and since i already own a 4890 i wanna crossfire it but i have no clue if my psu will handle it? also since my psu only has 2 6pin pcie connectors to power the card would i be able to use molex to 6 pin adapters heres a link to the power supply i bought a year ago keep in mind the price went up i only paid 65.00 new in box last year

http://www.ebay.com/itm/1000W-20-24-Pin-Large-Fan-SATA-12V-SLI-PCI-E-Intel-AMD-PC-ATX-Power-Supply-/400487727725?hash=item5d3eedc26d

so if i crossfire what are my options for the 4890

zeyuanfu · Jul 27, 2014

Kaitlin Kaschak459 :

I wouldn't recommend Crossfiring older cards, it'll yield only small improvements...
Anyways, if you REALLY insist on CF, then it is fine. 100 watts is more than enough, even for middle-end cards.

Gam3r01 · Jul 27, 2014

Well, this is a touchy topic. Your power supply should handle them fine, if it delivered its rated wattage. A 1000w PSU should have far more than 2 6 pin connectors, it should have closer to 8 6+2.

Open up the PC and look at the sticker on it. If you can post a pic, specifically we are looking at the 12v rail amps. I highly doubt that PSU outputs near 1000w.

Personally I wouldnt do it, you will only gain ~60-80% performance in the best cases, 0 in others. I would recommend a single, more powerful card.

SlayZombi · Jul 27, 2014

Yeah, it's an old card, might as well sell both, and buy a new single-card that would be twice as fast a those, and a lot less complicated!

Kaitlin Kaschak459 · Jul 27, 2014

the only 2 games i play ie resident evil 5 resident evil 6 support crossfire and i have 2 12volt rails with 36 amps on each rail

zeyuanfu · Jul 27, 2014

Kaitlin Kaschak459 :

If the rails don't deliver their rated power, aie aie aie...

Gam3r01 · Jul 27, 2014

It would support the cards if they deliever the rated amps, which I doubt.
The seller dosent show the sticker on the side, Im going to say that PSU delivers closer to 500w.

kunthakenthe · Jul 27, 2014

then it probably could handle it but still selling those and getting a better faster card(r9 270) would be better. You psu should handle it fine hoping it does what it says it does.

kunthakenthe · Jul 27, 2014

Gam3r01 :

i think i agree with you there so low amps for such high wattage(i've seen 650w deliver 54amps and this 1000w deliver only 36???).

Gam3r01 · Jul 27, 2014

I deliver 52A on the 12v rail on my tr2 700w.

kunthakenthe · Jul 27, 2014

Gam3r01 :

dont worry that was the corsair hx a super tier 1 psu but that should still run high end gpu's

Kaitlin Kaschak459 · Jul 27, 2014

36 per 12 volt rail for a total of 72 amps

Gam3r01 · Jul 27, 2014

There are few PSUs that you can actually add the 12v rails. My TR2 has dual 12v rails, the wattage listed is usually the total for all 12v rails.

kunthakenthe · Jul 27, 2014

Kaitlin Kaschak459 :

sorry but were really in doubt about that psu wattage/amps i doubt its giving anything it recommends. I would recommend you get a low cost card r9 270 or a r9 280x if you can afford it. and maybe a new psu. the 4890 are to old and most likely wont scale well(or provide tons more performance than a single card.) Also Gamer is right most psu's dont add 12v rails

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how can i tell if my psu can handle crossfire

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