Which is the best fit for my system, 2x GTX 580 or a GTX 590

[tborGU6428]

This is my current build:

CPU - Intel® Core™2 Extreme Processor QX9650 (12M Cache, 3.00 GHz, 1333 MHz FSB)

CPU COOLER - ASUS SILENT KNIGHT II

MOTHERBOARD - ASUS STRIKER EXTREME II

MEMORY - PATRIOT PVS34G1600LLK 4GB KIT

GRAPHICS CARD - 2 XFX GeForce GTX 280 Video Card - XXX Edition, 1GB DDR3, PCI Express 2.0, SLI Ready, (Dual Link) Dual DVI, HDTV
AND
BFG GeForce GTX 280 Video Card - OC2 Edition, 1GB GDDR3, PCI Express 2.0 x16, SLI Ready, (Dual Link) Dual DVI, HDTV, HDMI Support, VGA Support


POWER SUPPLY - Cooler Master Real Power Pro 1250-Watt Power Supply - SLI Ready, 80PLUC, 135mm Fan

OPTICAL DRIVES - Pioneer BDR-203 Blu-ray Disc Burner - 8X BD-R, 2X BD-RE, 8X BD-ROM, 16X DVD+R, 8X DVD+RW, 16X DVD-R
AND
PLEXTOR PX-810SA 18X DVD+/-RW

CASE - THERMALTAKE armor+ VH6000SWA (silver) aluminum super tower no power supply 7x5.25" 1x3.5" 7x3.5"(hidden) w/ see through side window front i/o, 230mm fan x 1 & 120mm case fan x 2

HARD DISC - 2 WD7500AAKS stat2 16mb 7200rpm hdd

MOUSE AND KEYBOARD - LOGITECH g9 laser mouse USB, Logitech G15 104 Normal Keys 29 Function Keys USB Wired Standard Gaming Keyboard

MONITOR AND RESOLUTION - Viewsonic VX2835wm, 28 inch,1920x1200

I want to upgrade my 3 SLI setup to either a 2x GTX 580 or a GTX 590. Which of these 2 cards will be the best fit for my current build. Some feedbacks please! And Thank you for time.

 

[jecho]

get a 590 then get a 2500k and a new motherboard you will probably bottleneck your system otherwise

 

[robertito]

A single 590 should handle 1920x1200 excellently and you have the option to add a second later that way.18

 

[wa1]

Single card will gives you less problem, so take that GTX 590 for now, you can add another one LATER in the future if you start feeling that card is not strong enough to handle most of games...

OC your CPU a little bit also help you a lot...

 

[tborGU6428]

Thank you for all the feedbacks, ok GTX 590 sounds good, while browsing for the best price on a GTX 590, I run into this; MSI N580GTX GeForce GTX 580 Lightning Xtreme Video Card - 3GB, GDDR5, PCI-Express 2.0 (x16), Dual-DVI, HDMI, DisplayPort, DirectX 11, Dual-Slot, Core Clock: 832 MHz, 3-way SLI Ready @ $599.99, would this card be more cost effective performance wise than that of GTX 590 price at $749.99?

 

[tborGU6428]

Best answer selected by tborGU6428.