I have two 6870s and about $300 CAD to spend. The relevant features are my mining rig are 2 PCI-E x16 slots and a OCZ ZT 700 Watt PSU. I'm currently squeezing 651MH/s on the rig, but want more mining power.
My questions are:
1. Would upgrading to 2 5870s be worth it(spending about $150)(they produce mininum 400MH/s each vs my 6870s at 225.5MH/s each)?
2. Would my PSU handle to overclocked 5870's, if not, would a Cougar CMX 700 Watt(from Gaming pc)?
3. Does anyone have a better recommendation for a Mining upgrade?
1. hmm i am getting up to 335Mhs on my 6870, maybe is worth to check configuration or other mining soft ? try cgminer 2.2.1 and drivers 11.6a you should get better Mhs

or there is just mistake and should be 325 as i see you have 651 for both ?
