Tom's Hardware > Forum > CPU & Components > Power Supplies, PC Cases & Case Mods > Silencer 910 and 2 Radeon HD 4850 X2 NOT in crossfire

Silencer 910 and 2 Radeon HD 4850 X2 NOT in crossfire

Forum CPU & Components : Power Supplies, PC Cases & Case Mods - Silencer 910 and 2 Radeon HD 4850 X2 NOT in crossfire

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Does anyone think this power supply will feed these video cards. I am using these so I can get 8 monitors. Using it for 2D graphics (charts and spread sheets) 90% of the time and some light gaming and movie watching the other 10%. ATI calls for 1000W when two are used in crossfire, but I wont be using them in crossfire. What do you guys think. Thanks.

http://www.newegg.com/Product/Prod [...] 6814102809

http://www.newegg.com/Product/Prod [...] 6817703022

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I would think it should be sufficient, as the PCP&C unit is of very high quality, however I am uncertain of the power requirements of the 4850X2.

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Reply to B-Unit

How accurate is the eXtreme Power Supply Calculator Lite v2.5. I used these inputs and it came out to 668 watts.

intel q9550
High performance MOBO (GIGABYTE GA-EP45-UD3P )
2 4850 x2 video cards in crossfire mode(not using crossfire)
4 sticks of DDR2
3 250mm fans
1 High speed SATA hard drive
calculated at 100% load!!!!!
1 DVD/CD burner

On the spec sheet it recomends 650w for one 4850 x2 and 1000w for two. This is saying I could get away with 2 4850 x2 cards with only 668w. Even if I went 30% over it would be 868w. If this is true then I think I will be ok. What do you guys think.

Reply to Rlyons124

Any thoughts on this one?

Reply to Rlyons124

I would recommend a Corsair HX750 or 850 instead, better quality, modular and more efficient.

Message quoted 2 times
Message edited by theAnimal on 07-02-2009 at 06:58:47 PM

theAnimal wrote :

I would recommend a Corsair HX750 or 850 instead, better quality, modular and more efficient.

The reason why I am using the 4850 x2 is so I could use 8 monitors, as stated before. I will check out that Corsair. Thank you. Does anyone know how reliable that number is from the calculator? Thanks.

Reply to Rlyons124

theAnimal wrote :

I would recommend a Corsair HX750 or 850 instead, better quality, modular and more efficient.

Better quality than PC Power and Cooling?

You sir are an idiot.

Stick with 850W+, anything less will be approaching its limits and will be less efficient and probably die sooner.

Message quoted 1 times

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Reply to B-Unit

I can't agree any more with B-Unit. "Theanimal", you are causing much more harm than good. If you are unsure about power requierments and power supplies, please don't post info which can cause confusion as well as costly repairs. Non Modular power supplies are generally more efficient because there is less junctions/connections. PSU manufactures have said the same and anyone with any electrical experience should come to the same conclusion. 910W should be sufficient, although I wouldn't use any less. PSUs age and therefore it is a good idea to get a little more now so you have enough later on.

Message quoted 1 times

------------------------------ Antec P182, i7 920 3.7Ghz @ 1.3V, Xigmatek 1283, Asus P6T X58, 3 x 2048MB OCZ Plat DDR3 1600 RAM, 2 EVGA GTX260 Core 216 in SLI, WD 160gb,320GB 1TB WD Black. Corsair 750TX. Acer 24" Monitor. Vista x64 Home Premium.
Reply to one-shot

B-Unit wrote :

Better quality than PC Power and Cooling?

Absolutely. Go look at some reviews.

Quote :

Stick with 850W+, anything less will be approaching its limits and will be less efficient and probably die sooner.

He's not using the cards in Crossfire, so only one will ever be stressed.

one-shot wrote :

PSUs and power requirements are something I know quite a lot about. The PSUs I recommended are plenty of power for the system.

Quote :

Non Modular power supplies are generally more efficient because there is less junctions/connections.

The HX750 and 850 are the first 80Plus Gold certified PSUs for sale.

Quote :

PSU manufactures have said the same and anyone with any electrical experience should come to the same conclusion.

PC P&C has been spreading this FUD for years.

Quote :

910W should be sufficient, although I wouldn't use any less. PSUs age and therefore it is a good idea to get a little more now so you have enough later on.

750W+ is more than sufficient. The OP is not using the cards in Crossfire. A single HD4850x2 uses ~220W at load. Only one card will ever be at load.

Why does the spec sheet say 650w for a single 4850 x2 and 1000w for a crossfire setup. It seams like you guys think this is way overkill or crossfire just puts that much more of a load on the system.

Message quoted 1 times

Reply to Rlyons124

Rlyons124 wrote :

Why does the spec sheet say 650w for a single 4850 x2 and 1000w for a crossfire setup. It seams like you guys think this is way overkill or crossfire just puts that much more of a load on the system.

AFAIK the second card in a CF/SLI setup actually uses a little less power than the first.

Recommendations are over-estimated to account for all the crappy PSUs which are available.

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Forum CPU & Components : Power Supplies, PC Cases & Case Mods - Silencer 910 and 2 Radeon HD 4850 X2 NOT in crossfire