Your links dont work, so it's hard to comment.
If your gfx cards were 70s, the phenoms may be a bit of a bottleneck.
I would not sweet it yet.
As with most setups, more cores only help if your progs can use them.
Running a bunch of crap in the background is a big demand for more cores. If you dont have more cores, dont act like you do, and you wont have a problem.
Calculator says; 512watts so 650watt will do the job.....
ASROCK, ASUS, or Gigabyte, just about any board they make will be fine.
But I'd go for x16 x16. I'd want some beefy heat sinks on the MB chip set with all that heat in the system. AND I'd want three (3) slots, NOT the typical two (2) slots between the PCI Express slots for extra cooling
It's a bottom mount power supply which is great so you'll be pulling cool air in to cool off the power supply nicely....
Looks like you can May able to install some optional front intake fans, get some your going to need them with the big Crossfire rig.... Typically your top card will run 10C to 15C hotter than your lower card. So, you have to keep the lower card in the low 70C's or you'll throttle....
You mention you have 6 Gb of RAM. How many RAM sticks to you have? And what size?
Thanks for your response. Good point with the extra pci to give a little more seperation between graphics cards. Was hoping to spend less but I think that would be money well spent.
My PSU now only has 2 6+2 pins so while it could probably swing it in the wattage department I'm short a couple if power connectors. I will most likely put this PSU in my HTPC as it has a cheap apevia PSU that came with the case. It's run fine for a year but it's pretty low end.
My case is an Antec 300 and the 6950 fits with about a 1/8" to spare. (2) cards is going to be tight but doable.
Started this system on Win XP and so had a 2gb stick of ram. Once I upgraded to Win 7 I added one 4gb stick of ram.
My main reason for the upgrade is that i'm running eyefinity and one card although impressive on one monitor does'nt have enough power for the 5760x1080 Resolution.
I have room for one more fan upfront and will definately be adding one 120mm. I've got all the rest already installed 120mm in top,back,side,front
Thanks for the good idea on more than one pci and separation
On the RAM, I believe using a 2Gb stick matched with a 4Gb stick will force your system to running single channel all the time. That will cut your memory band width in half and slow your CPU and system down. I recommend spending $35--$40 on another Matching 4Gb stick... (remove the 2Gb stick completely...)
NOTE: if your NOT running the 64 bit version of Win 7 the most RAM you can access is 3.25Gb, soooo, just buy a second 2 Gb stick and remove the 4 Gb stick from the system.....
One the power supply, many video cards come with a pair of Molex to 6+2 pin adapter cables like those pictured here (next to the box)
You should be able to run fine using adapters..... (then if you upgrade later, get an 850watt so your ready for just about anything and it's only a few dollars more than a 750watt (I use the Corsair 850HX in two of my SLI systems...))
Interesting.....started with Win xp as I had it on hand so 2gb was fine. I was then able to get Win 7 through my student discount for 29.99 and decided to upgrade and at that time I bought the other 4gb stick. I guess my memory has not been optimized this whole time? Memory has really gotten cheap guess another 4gb chip won't break the bank. I can always put the the 2gb in my HTPC for a total of 4gb
Thank you for the molex adapter tip....would be nice to minimize costs and keep using the PSU i have.
This started as a budget replacement for my aging p4 when I built it about a year ago. It's been a great rig so far.
I'm going to have to tear most if it apart when I upgrade the MB to a crossfire board. I'm starting to consider keeping the 6950 and 4gb ram & trying to sell the computer with out it. Start from scratch and build something new with a larger case with better ventilation.
The MB and GPU are gonna run $400. Depending on what I can sell mine for It would'nt be a whole lot more to just upgrade everything.
Guess I will have to weigh how easily I could sell it.
Thanks again for the advice on the molex adapter if I go that route it will save me $100, something I would'nt have thought of.