which psu for 2 x 4890's?

[abitlost]

Hi again all

after the great advice you all gave me on buying my sons graphic card - which he was over the moon with, so thanks again - i thought i'd pop back and ask for some advice on abit of an upgrade to my own system...

basically, i need your recommendations for a new psu as im going to (attempt to) use two graphic cards now (crossfire?)

my cards are : (er... this is what it says on the boxes)

sapphire vapor x toxic hd 4870 1gb gddr5 pci-e dual dvi-i/tvo
xfx radeon hd 4890 1gb gddr5 dual dvi tv pci-e

my system specs are: (these are just copied from the "properties" in "my computer" so please advise if i need to supply any more info)

Intel (r) Core (tm) 2Quad cpu
Q9650 @ 3.00ghz
3.00 ghz, 3.25 ghz ram

at the moment my psu is a 750w rubbish no-make one (win power??)
and im using windows xp 32 bit
my monitor is a 42 inch toshiba - which doubles as a telly and erm... i dunno, do you need any more info?

oh yes, i play games like wow (shush!) the sims 2 and 3 (dont you Dare comment!) Silverfall, The Witcher and fallout

many thanks for any advice you can offer

 

[chipps101]

http://www.overclockers.co.uk/showproduct.php?prodid=CA-116-AN&groupid=701&catid=123&subcat=

one of these should do the job nicely but i doubt you will get it to work as the 4870 and 4890 are different cards, you would need either 2 4870's or 2 4890's

 

[kmufc77]

This and cheaper than the above PSU . http://www.overclockers.co.uk/showproduct.php?prodid=CA-011-CS&groupid=701&catid=123&subcat=1084

I swear by Corsair for PSUs,simply the best in my experience

 

[Surveyor]

I think from the following chart they will work but it's not a recommended combination.

 

[stulid]

This http://www.overclockers.co.uk/showproduct.php?prodid=CA-117-AN&groupid=701&catid=123&subcat=1088

Cheaper than all the psu suggested in this thread so far.

more than enough for the job.

 

[Surveyor]

I think 32 bit Windows will be a problem.

It looks like you have 4GB of RAM and can currently use 3.25GB.

If you install two 1GB graphics cards won't the amount of RAM you can use be reduced as the 2GB on the graphics cards will need to be mapped into the 4GB of space which 32 bit Windows can address?

 

[chipps101]

I think from the following chart they will work but it's not a recommended combination.

it doesn't say in that chart that it will work

 

[abitlost]

I think 32 bit Windows will be a problem.

It looks like you have 4GB of RAM and can currently use 3.25GB.

If you install two 1GB graphics cards won't the amount of RAM you can use be reduced as the 2GB on the graphics cards will need to be mapped into the 4GB of space which 32 bit Windows can address?

oh nooooo i didnt even think of anything like that... just thought it would work cos they're so similar... what should i do now then?

 

[chipps101]

for the games you have mentioned the 4890 would probably be fast enough so try that and see how it gets on

 

[Martini1991]

The 4870 and 4890 will crossfire together fine though..

 

[abitlost]

ooo yay, thats a ray of hope then... but... should i be worried about what surveyor has pointed out?

this?

I think 32 bit Windows will be a problem.

It looks like you have 4GB of RAM and can currently use 3.25GB.

If you install two 1GB graphics cards won't the amount of RAM you can use be reduced as the 2GB on the graphics cards will need to be mapped into the 4GB of space which 32 bit Windows can address?