Considering an upgrade to raise my framerates

I play World of Tanks and my frame rates on high bounce around 25-30. I would like to get them in the ballpark of 50. Considering a new video card: http://www.newegg.com/Product/Produc...82E16814121625 and upgrading my RAM: http://www.newegg.com/Product/Produc...82E16820231314.
Would that be enough or is my MD/processor gonna hold it back?
Thanks,
Chief

Current System:
MSI P55-GD80 LGA 1156 Intel P55 ATX Intel Motherboard
Intel Core i5-750 Lynnfield 2.66GHz LGA 1156 95W Quad-Core Processor BX80605I5750
G.SKILL Ripjaws Series 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-4GBRL
2 x GIGABYTE GV-N250-1GI GeForce GTS 250 1GB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card
Microsoft Windows 7 Professional 64-bit 1-Pack for System Builders - OEM

I find it hard to believe that WoT is that demanding on video cards, no offense...
So GTX 560 Ti seem bit overkill...

I would double the memory for sure though...

WEll how much can you spend on an upgrade???

A GTX 560 and some extra ram would be a cost effective upgrade...

If you have 1100 bucks you can some RAM and a Nvidia 690 based video card.