Is it possible to crossfire sapphire 4850 1.00 GB with 512 MB

[rezwan22]

I was wondering wether is it possible to crossfire Sapphire hd4850 1.00 GB with another Sapphire hd4850 512 MB card since they both run at the same default stock clock at 625 so is it possible to crossfire them


here's my rig

Intel core 2 duo e6420 @ 2.13ghz
Transcend rams (800 MHz ) 2GB two sticks
Gigabyte P45C-DSR crossfire ready board
Thermaltake 500 watts powersupply
samung 320 GB Hardrive
hitachi 160 GB Hardrive
Sony DVD ROm

 

[n00b_SLicer]

Yes, but check to make sure you have enough amps on your 12V rail(s).

 

[rezwan22]

Yes, but check to make sure you have enough amps on your 12V rail(s).

my psu has three 12V rails and it's a 500 watts psu so i guess i have to change the psu as well was looking forward to get the same brand psu thermaltake 650 watts psu

 

[stoner133]

Also one more thing to remember about Crossfire, it doesn't combine the memory for both the cards. It only has the two GPU's working together. The memory will be set by which card is used as the master card (one with your monitor connected to it). So make sure your 1Gb card is the one you use as the master(usually the card in the top slot) that way its not using the memory on the card with 512mb.

 

[n00b_SLicer]

my psu has three 12V rails and it's a 500 watts psu so i guess i have to change the psu as well was looking forward to get the same brand psu thermaltake 650 watts psu

Not necessarily, post a link to your PSU specs.

 

[rezwan22]

Not necessarily, post a link to your PSU specs.

here's the link of mypsu myfriend http://www.svc.com/w0093ru.html

 

[n00b_SLicer]

Also one more thing to remember about Crossfire, it doesn't combine the memory for both the cards. It only has the two GPU's working together. The memory will be set by which card is used as the master card (one with your monitor connected to it). So make sure your 1Gb card is the one you use as the master(usually the card in the top slot) that way its not using the memory on the card with 512mb.

This.

here's the link of mypsu myfriend http://www.svc.com/w0093ru.html

Ya, that doesn't have enough power.
Try this or this instead of another TT power supply. They're cheap, good quality, and have one large 12V rail.

Good luck.

 

[invisik]

it might work give it a try.

 

[rangers]

Also one more thing to remember about Crossfire, it doesn't combine the memory for both the cards. It only has the two GPU's working together. The memory will be set by which card is used as the master card (one with your monitor connected to it). So make sure your 1Gb card is the one you use as the master(usually the card in the top slot) that way its not using the memory on the card with 512mb.

wrong, the one with 1gig will be cut back to 512meg

 

[boygenius]

Crossfiring the cards will be no problem. I'm not sure on the memory thing but even if the clock speeds werent the same, it would still work, just the faster clock would be slowed down to match the slower clock speed. You could also overclock the slower GPU. In fact, you can even cross fire a 4850 with a 4870 although it is not recommended. For the power supply, I personally would avoid single 12V rails. I run an OCZ 700 watt PS with 4 12v rails.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817341002

 

[n00b_SLicer]

Crossfiring the cards will be no problem. I'm not sure on the memory thing but even if the clock speeds werent the same, it would still work, just the faster clock would be slowed down to match the slower clock speed. You could also overclock the slower GPU. In fact, you can even cross fire a 4850 with a 4870 although it is not recommended. For the power supply, I personally would avoid single 12V rails. I run an OCZ 700 watt PS with 4 12v rails.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817341002

Why would you avoid a single 12V rail?

 

[boygenius]

Personal preference. You can't say single is better then multiple or vice versa. Just when buying multiple rails you need to make sure that the m/b, PCI-E1 and PCI-E2 are all on different rails. Most rails are rated at 18A which is plenty of power to run anything you would have on that rail, plus even though it's rated at 18A, many can handle up to 20A.