HD6770 Xfire advice please

[EthnicBadger]

How do,

I'm running with a single 6770 at the moment and I've been offered another 6770 from a friend at a bargain £20.

I'm planning on getting it and installing it alongside the existing as a cheap upgrade. Problem is I've never (knowingly) worked on an overclocked system so I haven't a clue if I'm going to screw up the systems stability by doing this.

Can anyone advise as to whether I'm likely to encounter any problems with the CPU overclock - I'm assuming I won't. Also will the 650w PSU be ok with the extra drain?

Specs:
ASUS Sabertooth 990FX board
650w PSU
AMD FX 6100 @ 4.03Ghz
8GB RAM
XFX HD 6770 1GB
Standard optical drive
Single 1TB Seagate HDD

Any assistance would be appreciated.

 

[Tonester0011]

You wont, just make sure you have a CF bridge
What PSU do you have? 650W more than enough, just hoping its not a cheap and nasty one

 

[Nuclear Fusion]

Provided it is a decent 650W PSU and you have a crossfire bridge, then you are set to go

 

[EthnicBadger]

While not the greatest by far, the PSU is a OCZ ZS series so should be up to the job.

Thanks for the advice both

 

[HankScorpio]

I had 5770 CF on a solid 500w psu, so 650 is more than enough. These cards don't draw too much power.