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Twin 2 gig 5870's

Last response: in Graphics & Displays
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April 10, 2010 12:33:35 AM

So, I noticed these http://www.tigerdirect.com/applications/SearchTools/ite... tonight.

Essentially, 5870's with 2 gigs of ram each. The card itself says 600 watt psu required for one, so, what's the minimum psu you would use to X-Fire these bad boys?

No idea why the put 6 display ports on it though... unless they intend it to support that crazy eyefinity 6 thing when it's released.

Anyways...

What size PSU to run 2 of those?

Think a Corsair TX750 with 60 Amps on the main rail could handle two of those with a Phenom II x4 940 black?

Or should I be getting a larger power supply?

More about : twin gig 5870

April 10, 2010 12:36:54 AM

chaos2000 said:
No idea why the put 6 display ports on it though... unless they intend it to support that crazy eyefinity 6 thing when it's released.


That's exactly why.

http://hothardware.com/Articles/ATI-Radeon-HD-5870-Eyef...

As for the PSU requirements....

http://www.amd.com/us/products/desktop/graphics/ati-rad...

600 Watt or greater power supply is recommended with one 75W 6-pin and one 150W 8-pin PCI Express® power connector required (900 Watt and 2 6-pin and 2 8-pin connectors for ATI CrossFireX™ technology in dual mode)
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April 10, 2010 12:45:42 AM

Any idea about how tough a PSU I'll need to X-Fire them?

Ack you edited... let me see what you edited :) 

...

Yikes... gonna need to upgrade my PSU... bummer... Or just only use one... I was hoping a pair of them would outperform the new 480's in practically every conceivable way.

I only use Photoshop CS4 to color 2D Lineart so... CUDA doesn't mean jack all to me.
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April 10, 2010 12:50:55 AM

900Watts...what bullshit.

Assuming you're not overclocking, 700Watts will be fine. Each HD5870 won't use more'n 180Watts IIRC.


holy hell..that means it won't use more'n 110Watts for typical gaming?
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April 10, 2010 12:57:41 AM

Well I will have to see what sort of power connectors are necessary as well. My TX750 (Never ever had a problem with Corsair psu's) only has 4 six pin connectors for PCIe. Will need to check see if these beasts -require- 8 pin connectors as unfortunately Tiger Directs page on them doesn't have what cables are necessary.
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April 10, 2010 1:04:12 AM

Why do you need a 2gb?

Same frames as 1gb for Non-Eyefinity.
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April 10, 2010 1:13:02 AM

I am slowly building a new machine. Next on the list is an I7 930 with new mobo and 6 gigs of DDR3 1600. Then an SSD HD for the OS and applications. And I do want to use 3 monitors (Though never likely 6) as I -do- multi-task Photoshop CS4 and/or Manga Studio EX 4.0 with other things, and I admit to a guilty pleasure of wanting to see if I could get EVE across 3 monitors ;)  Let alone other stuff.

In the end the system is going to look something like this:

HAF932 Full Tower Case
Ultra 1050w PSU Silver
I7-930 OC'd as high as I can get it and keep it stable on Air with a decent cooler.
Possibly the ASUS P6X58D Premium or similar mobo
6-12 gigs DDR3 1600mhz memory
Probably OCZ Agility SSD for Win7+apps
1.5 TB Storage SATA HD
Two of the above Sapphires
DvD Burner, etc.

The point is I have a nice sized return coming, and it's likely to be the last large chunk of money I'll be getting in a long while. Thus, want to build a machine that will LAST a long while, as long as theoretically possible.
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April 10, 2010 1:24:24 AM

If you're using it on anything less than a 1920x1200 monitor, 2GB is a waste.

These cards are designed for use at massive Eyefinity resolutions where the added frame-buffer actually becomes a factor.
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April 10, 2010 1:25:13 AM

Would go for 922.

Would go for tx-950 over that psu (140$ for corsair 950w=win)
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April 10, 2010 1:30:11 AM

Thanks BB,

I'll check out the Corsair, I love my tx750 so would prefer to go Corsair again. Was just looking at the 1050 Ultra and the lifetime warranty was nice as well as all the connectors for my needs...

Also Razbery, I'm looking at 5760x1200 resolution or 5760x1080 resolution at minimum. Thus the extra RAM -should- become a factor. Also, much of the ceiling that a 5870 hits with high settings is due to ram amount judging by numerous articles, so the 2 gigs should be a large help there as well.
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April 10, 2010 1:32:29 AM

I think a tx-750 should handle 2 5870.

You might be fin with what you have now.
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April 10, 2010 1:42:46 AM

Well, wattage wise I -might- be ok (And probably am until I get the power hungry I7) but the TX750 doesn't have any 8 pin PCIe power connectors... which I'll need two of. The TX950 doesn't have any either, which is moderately annoying. Guess I'll have to look for some sort of adapter... though I don't know how reliable they are. Since each card requires a 150W 8 pin adapter and a 75 watt six pin. Technically, my 750 should be more than enough wattage for that even if both cards were hitting 225 constantly.

Edit: Orrrrrr I can see if I can dig up two of the 6-8 pin adapters that probably came with the TX750... Corsairs pretty good at that...
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April 10, 2010 1:50:37 AM

An HD5870 uses 2x6-pin. You're fine with 4x6-pin PCI-E.

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April 10, 2010 1:52:26 AM

@ Shadow187:

The 5870's I'm looking at (See original post) use a six and an 8 pin each.
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April 10, 2010 2:04:46 AM

shadow, the 2GB cards use 1x6 and 1x8, each.

chaos. I'm relieved this isn't for some silly single monitor setup.

As for PSU concerns... I believe this setup should function properly on a quality ~750W PSU. I've seen 2x4890 setups on 700-800W PSUs before with no reported problems, and 4890's are close to 5870 power reqs.
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April 10, 2010 2:08:22 AM

Yeah I am fairly certain my 750 can handle it, MOSTLY because it's a Corsair PSU and Corsair just makes tough as nails PSU's. So that's one thing less I have to buy I am thinking. Though I might upgrade the PSU just to get a modular setup, as the tx750w isn't modular... might as well go for as clean an interior as I can for most ideal air-flow since I don't want to deal with liquid cooling.
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April 10, 2010 2:15:06 AM

Consider an Antec TP-750 then. It's semi-modular, so at least you can adjust some of the cabling, specifically the PCIe and SATA. 80+ Bronze rated and it's $99.99 at Newegg right now with a $10 promo code, $79.99 w/ $20 MiR. It is, however, a quad-rail design.
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April 10, 2010 2:17:54 AM

Dunno if it's still a factor, but when I first started messing around with dual video cards oh so many years ago, it was the general consensus that a massive single rail was much better than a multi-rail psu for multiple video cards.

Have the multiple rails been improved to the point where the power is as steady as a massive single rail these days? Haven't really researched it lately, just been going with what I knew.
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April 10, 2010 2:18:21 AM

chaos2000 said:
Yeah I am fairly certain my 750 can handle it, MOSTLY because it's a Corsair PSU and Corsair just makes tough as nails PSU's. So that's one thing less I have to buy I am thinking. Though I might upgrade the PSU just to get a modular setup, as the tx750w isn't modular... might as well go for as clean an interior as I can for most ideal air-flow since I don't want to deal with liquid cooling.


700W corsair units can output 900+Watts without producing the magic smoke.

(not to say thats a good idea over a long persiod of time)
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