Bottleneck?

[Footyslayer]

Hi all,

my friend is slowly upgrading his PC but has done it a bit back to front, he has just got a superflower 850w PSU and an AMD 7990. Trying to play FIFA 15 it lags like hell and BF4 won't even boot up.

Now he has a Gigabyte GA-MA790X motherboard and a AMD Phenom 2 x4 920 running at 2.8ghz.

That motherboard and CPU are very old, could that be whats causing the issue here? BF4 ran on this system with a Radeon 4870, obviously that was fine for that CPU.

Is the 7990 too powerful and is causing gaming issues?

 

[Footyslayer]

The 7990 is the only card being used, which is a dual GPU card. The 4870 is what he used to use and it worked with that CPU, the 7990 seems to struggle with lag in a few games. I am just trying to work out if the CPU is causing this because its not very compatable with the 7990?

 

[Footyslayer]

Off the top of my head the motherboard BIOS is updated, there has been no new release BIOS wise for years!

The PSU arrived on Monday and is brand new...

http://www.overclockers.co.uk/showproduct.php?prodid=CA-019-SF&groupid=701&catid=123&subcat=2466

BF4 does boot up now that was a different issue, however FIFA 15 is really, really laggy and is unplayable.

Any other idea's?

*EDIT*

Just had a thought, he is using 8GB DDR2 at the minute prior to a motherboard and CPU upgrade, possible issue here also?

 

[Footyslayer]

Any other suggestions please?