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Will my Psu Be able to run two 4890's in Crossfire ?

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a b U Graphics card
January 2, 2010 10:42:41 PM

I am planning on getting two 4890's in crossfire but im not sure about my psu , My current One is :
http://www.overclockers.co.uk/showproduct.php?prodid=CA...

As for the rest, i have a AMD phenom II X4
Coolermaster V10 ( Will be overclocking soon to 3.8Ghz )
8 GB Ddr3
Two samsung spin points in raid 0 and a single 5400rpm hard drive
LG blu ray Optical drive
and only a few usb items.

Thanks in advance, :D 



More about : psu run 4890 crossfire

January 2, 2010 11:24:22 PM

Your power supply unit, OCZ StealthXStream 700W PSU has an overall of 72 amps on the +12V railings (18A on each of the four +12V railings). It has way enough amps for 2-way CrossfireX but the PSU is lacking the 6-pin pci-e power connectors. For one HD 4890, you would need 2x6-pin pci-e power connectors yet your PSU has one 6-pin and one 6+2 pin. That would mean, if you want to keep the power supply unit (which i recommend doing), then you should buy a molex to 6-pin pci-e connector adapter. This just basically transforms 2x molex connectors into one 6-pin connector, although you would need 2 of those adapters in order to have enough pins for your second HD 4890.

Sources:
Your card on newegg (ATI website made me rage, loaded too slow):http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Your power supply on newegg:http://www.newegg.com/product/product.aspx?Item=N82E168...

Just reply if you need anything else
Related resources
a c 1363 U Graphics card
January 2, 2010 11:35:22 PM

drkzin said:
Your power supply unit, OCZ StealthXStream 700W PSU has an overall of 72 amps on the +12V railings (18A on each of the four +12V railings). It has way enough amps for 2-way CrossfireX but the PSU is lacking the 6-pin pci-e power connectors. For one HD 4890, you would need 2x6-pin pci-e power connectors yet your PSU has one 6-pin and one 6+2 pin. That would mean, if you want to keep the power supply unit (which i recommend doing), then you should buy a molex to 6-pin pci-e connector adapter. This just basically transforms 2x molex connectors into one 6-pin connector, although you would need 2 of those adapters in order to have enough pins for your second HD 4890.

Sources:
Your card on newegg (ATI website made me rage, loaded too slow):http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Your power supply on newegg:http://www.newegg.com/product/product.aspx?Item=N82E168...

Just reply if you need anything else

72x12=864watts!!!!! It is not calculated that way! That power supply has 675 watts for all the +volt rails if we use it all as +12 volts we get 675/12=56.25 amps and that is not leaving any power for the +3.3 and +5 volts.
That does not change it, it is still big enough for the Crossfire system.
a b U Graphics card
January 3, 2010 12:07:30 AM

Yep. Very common mistake - adding up the max power per rail and assuming that that is the max total power available.
a b U Graphics card
January 3, 2010 3:43:01 AM

If you have a standard ATX setup... Any ATX PSU WILL work. (So most likely if your running an ATX mobo your whole system will work with an ATX PSU...)
a b U Graphics card
January 3, 2010 3:43:51 AM

And yes make sure you have the right amount of connecters...(Look at your parts requirements online...)
a c 1363 U Graphics card
January 3, 2010 3:47:38 AM

gidgiddonihah said:
If you have a standard ATX setup... Any ATX PSU WILL work. (So most likely if your running an ATX mobo your whole system will work with an ATX PSU...)

??????????????
a c 171 U Graphics card
January 3, 2010 7:13:58 AM

Must be a joke post. No way my 250W ATX PSU would work.
a b U Graphics card
January 3, 2010 7:39:50 AM

Quote:
I am planning on getting two 4890's in crossfire


Why on earth would you do that in this day and age? Here's a better idea:

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

There. Problem solved. And for only $0.01 more than a pair of 4890s, you get DX11 compatibility.
January 3, 2010 1:21:45 PM

Two thoughts?

If you are buying 2 video cards - go buy a good PSU, and if you do not know what you are doing, make sure it says crossfire or SLI ready. The number of questions from people buying highend graphics cards and then asking about their PSU is amazing. I say try it and if it doesnt work, go buy a new power supply.

Second, why buy ATI 48xx anything now as capt points out. That one 5780 card will be faster (look at the benchmarks) and the same cost - with less power. If you cannot figure out you PSU, thats the answer....

Good luck
January 3, 2010 3:22:50 PM

gidgiddonihah said:
If you have a standard ATX setup... Any ATX PSU WILL work. (So most likely if your running an ATX mobo your whole system will work with an ATX PSU...)

:lol:  :lol:  :lol:  :lol: 
try to use this with any decent high end video card and your screwed. This statement couldn't be more false.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
46A to the 5v .... :non: 
:pt1cable:  :pt1cable:  :pt1cable: 

I prefer overkill, most psu run more efficient when they are at lighter loads, and less efficient at full load, plus upgrading in the future won't have to inlclude your psu.
January 3, 2010 3:38:48 PM

Is it ocz 700 watt enough for GTX285 sli and quad 9550 @ 3,8 Ghz thank you all !
a c 1363 U Graphics card
January 3, 2010 3:50:02 PM

Milos-stancene said:
Is it ocz 700 watt enough for GTX285 sli and quad 9550 @ 3,8 Ghz thank you all !

No! you should open a new thread!
a b U Graphics card
January 3, 2010 7:21:02 PM

2048505,13,301646 said:
:lol:  :lol:  :lol:  :lol: 
try to use this with any decent high end video card and your screwed. This statement couldn't be more false.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
46A to the 5v .... :non: 
:pt1cable:  :pt1cable:  :pt1cable: 

Do you mean that the ATX form factor PSU might not have the cables? I mentioned that you needed to make sure you had all the cables...

And if your running an ATX form factor Mobo you'll MOST LIKELY (Sorry this is what i meant lol) not need to worry about the volts to the rails (Never really got WHAT that meant but i know what works with what lol... )So if you are running the high 5xxx (Dont know ATI super well) or the GTX 295 then you might want to look into the volts on the rails for what you have and what u'll need...

Sorry about that...

And i totally agree.. I like overkill but sometimes you cant afford it (Makes the PSU last longer...). I have a 500watter on a:

P4 3.2Ghz
3 gigs of RAM 533
9600GT
1 TB of HD space total (2 HD's)

And i know when i go for the:

AMD Phenom II x4 955 Black Edition 3.2Ghz (6mb on the L3)
Hopefully go up to 8 gigs but most likely 6gigs of RAM
My 9600GT
320 WD Hard drive 7200
At least two 120mm fans and two 250's (I like it cool)

Ill be using the 500 watter but im not sure if it will run the PSU too far... So idk lol

(yes i know it wont be a killer machine but it will run way better than what i have now...)

a b U Graphics card
January 3, 2010 7:23:32 PM

Milos-stancene said:
Is it ocz 700 watt enough for GTX285 sli and quad 9550 @ 3,8 Ghz thank you all !



Im thinking... Im thinking... Im thinking... (Sorry lol)

NO!!! Well it... With the GTX 285 SLI'ed then ya it will be cutting very close but look at the PSU calc site that i mentioned up further...

And try to go 1000watts it will work and leave you with a little breathing room to say the least hehe...
January 3, 2010 7:33:50 PM

What about GTX380 X2 Dual card ---NOQuad ?
a b U Graphics card
January 4, 2010 4:55:41 PM

I was also considering getting a second 4890 for crossfire. I have a 700W FSP power supply. It says that it has 18 amps on each of the 4 +12v rails. How can that add up to 700W? 700w/12v=58amps Is this a typo on their part or am I calculating it wrong?
a c 1363 U Graphics card
January 4, 2010 7:32:46 PM

You should open a new thread as well. The 18 amp on each rail is the max for individual rail, it does not mean that you add them all up together because they would not all be at max at any given time. Most good quality state the max wattage for each voltage under their amp rating and that is the number that you divide with the volts to get the max amps.
!