I'm planning to upgrade my current pc of 4 years for gaming purpose. I've done quite a bit of research but couldn't find what i was looking for or maybe i'm just too newbie to put everything together to form a bigger picture. Therefore I'm hoping you guys could help with my questions.
Currently I have a PCI-e 2.0 motherboard (Asus M3A32-MVP Deluxe - http://www.asus.com/Motherboards/AMD_AM2Plus/M3A32MVP_DeluxeWiFiAP/) with 8GB of DDR2 RAM and more than enough power (800w psu). I'm contemplating of purchasing a HD7970 graphic card which is a PCI-e 3.0 card to put into my motherboard and will drive five 27" monitors at 1920 x 1080 resolution using Eyefinity (tricking the OS into thinking that I have ONE very big screen instead of 5). Will such system work without the performance suffer.... much?
I understand that PCI-e 2.0 x16 is capable of 8Gbps bandwidth and PCI-e 3.0 x16 has up to 16Gbps bandwidth. A simple arithmetic calculation gives me the number of bits required to store information of ONE monitor at 1920 x 1080 resolution in 24 bits per pixel (bpp) colour depth of ONE frame.
1920 * 1080 = 2,073,600 pixels 2,073,600 * 24bpp = 49,766,400 bits
So for the number of bits for 5 monitors
49,766,400 * 5 = 248,832,000 bits
If I want a smooth 60 frames per second (FPS) it'll be
248,832,000 * 60 = 14,929,920,000 bits/sec
So the data transfer rate is a whopping 15Gbps and only PCI-e 3.0 can support it nicely.
What happen if I still plug that card into a PCI-e 2.0 slot? Will the system tune the FPS down automatically (which means my FPS will suffer and drop to about 32 FPS) OR the entire system will fail ultimately (or slowed to a crawl which isn't worth investing in)?
Can I get two identical graphic cards to distribute the burden (3 monitors on the first card and 2 on the second card)? According to my mobo specification, dual card mode can still achieve x16 lanes each which means the total bandwidth can be increased up to 16Gbps. Will Eyefinity still work (5 monitors combined together to make ONE very large display)? Do I need CrossFire (which i prefer not to due to microstuttering)?, which in this case the configuration will be all 5 monitors on the primary card.
I really hope someone is able to shed some light on my dilemma. Can I just buy a high end card and get a maximum gaming experience, or should I save up and change my entire gaming system? Thanks in advance =)