Hey everyone 
Just so you're familiar with my current rig:
Now, from what I understand it's generally accepted to have one faster single GPU over two crossfired ones performance wise as some games don't support it and micro stutter.
So, it would be wiser to get this instead of another 6950 right:
http://www.overclockers.co.uk/showproduct.php?prodid=GX-155-MS&tool=3
That is really the max I want to spend on the upgrade really.
Performance wise, I see a big difference, being that I can only get the 6950 to 900/1350 stable while the 7970 has 1010 core, not sure on the mem clock but I've seen people OC them to 1200/1575 which is a big improvement over mine. Now although I can see that improvement in the numbers, how does that translate into FPS and smoothness? Granted mine plays almost all games on Ultra with a solid FPS but sometimes the MSAA can make it cry. Not to mention I'm getting an extra GB of VRAM.
So I'd just like to know what to expect performance wise with the newer card. I generally only buy a new GPU when I see the current one struggle and this does slightly in Far Cry 3.
Now, if anyone has a better card for suggestion I'm all ears.
Secondly, I want to replace my BD-ROM drive with a BD-RW so I can burn to Blu-Ray discs, I was looking at these two, which is better?
http://www.overclockers.co.uk/showproduct.php?prodid=CD-116-LG&groupid=701&catid=10&subcat=314
http://www.overclockers.co.uk/showproduct.php?prodid=CD-151-SA&groupid=701&catid=10&subcat=314
Finally, I'd like to ask if that 7970 would be fine with my current PSU and if it's any bigger than the 6950 2GB so I know if it will fit

Just so you're familiar with my current rig:
1 x Cooler Master CM-690 II Lite Dominator Case
1 x Gigabyte Z68XP-UD3 Intel Z68 (Socket 1155) DDR3 Motherboard
1 x Intel Core i5-2500K 3.30GHz (Sandybridge) Socket LGA1155 Processor - OEM
1 x Gelid Tranquillo CPU Cooler (Socket 754/939/940/AM2/AM2+/AM3/LGA775/LGA1155/LGA1156/LGA1366)
1 x Sapphire ATI Radeon HD 6950 "Dual Fan Edition" 2048MB GDDR5 (Unlocked to 6970)
1 x Kingston HyperX Genesis Grey 8GB (2x4GB) DDR3 PC3-12800C9 1600MHz Dual Channel Kit
1 x XFX 650W XXX Edition Modular '80 Plus Bronze' Power Supply
1 x Lightscribe Blu-Ray DVD+RW+DL Drive (My old one)
1 x Seagate Barracuda 7200.12 500GB (My old one)
1x Seagate Barracuda 1TB
Now, from what I understand it's generally accepted to have one faster single GPU over two crossfired ones performance wise as some games don't support it and micro stutter.
So, it would be wiser to get this instead of another 6950 right:
http://www.overclockers.co.uk/showproduct.php?prodid=GX-155-MS&tool=3
That is really the max I want to spend on the upgrade really.
Performance wise, I see a big difference, being that I can only get the 6950 to 900/1350 stable while the 7970 has 1010 core, not sure on the mem clock but I've seen people OC them to 1200/1575 which is a big improvement over mine. Now although I can see that improvement in the numbers, how does that translate into FPS and smoothness? Granted mine plays almost all games on Ultra with a solid FPS but sometimes the MSAA can make it cry. Not to mention I'm getting an extra GB of VRAM.
So I'd just like to know what to expect performance wise with the newer card. I generally only buy a new GPU when I see the current one struggle and this does slightly in Far Cry 3.
Now, if anyone has a better card for suggestion I'm all ears.
Secondly, I want to replace my BD-ROM drive with a BD-RW so I can burn to Blu-Ray discs, I was looking at these two, which is better?
http://www.overclockers.co.uk/showproduct.php?prodid=CD-116-LG&groupid=701&catid=10&subcat=314
http://www.overclockers.co.uk/showproduct.php?prodid=CD-151-SA&groupid=701&catid=10&subcat=314
Finally, I'd like to ask if that 7970 would be fine with my current PSU and if it's any bigger than the 6950 2GB so I know if it will fit
