GTA IV - Graphic Card Problem

hey,
i recently bought gta iv for pc. just to notice that my graphic card runs it very laggy and ugly, its unplayable. i would like a new graphic card.

heres another thread i posted on if anyone wants to see their suggest and maybe recommand one of them http://forums.techguy.org/games/83 [...] ost6732996

computer:

Manufacturer: HP-Pavilion
Processor: Intel(R) Core(TM)2 Quad CPU Q6600 @ 2.40GHz (4 CPUs), ~2.4GHz
Memory: 3070MB RAM
Hard Drive: 309 GB
Video Card: NVIDIA GeForce 8400 GS
Monitor: HP w2207 Wide LCD Monitor
Sound Card: Speakers (Realtek High Definition Audio)
Speakers/Headphones:
Keyboard: USB Root Hub
Mouse: USB Root Hub
Mouse Surface:
Operating System: Windows Vista™ Home Premium (6.0, Build 6000) (6000.vista_ldr.071023-1545)


i would like a good one that would run gta iv with no lag and maybe medium.
im in canada and i dont use ebay so please check retail stores like tigerdirect.

thanks

Need to know what your PSU is to suggest one. let me know and I will check it out. and you may wanna think about bumping your CPU up 400Mhz as GTA4 is very CPU intensive. It might not be your Video card at all thats the problem.

I havnt really played GTA 4 so I wouldnt know , I jsut know its a console port and wouldnt have that great of Graphics. PS3 has a 8600 series... sorta , made specifically for it by Nvidia.

GTA 4 is worst coded game ever. yes, no optimization at all. I have q6600 at 3.6, 4gb DDR2 and GTX 295 and no way to play it at max settings (res 1920*1080), thus I can but with 25fps avg. which is not playable for me. Moreover game does not support SLI so it´s using only with one core of my dual GPU indeed ( i don´t know about CF)
make long story short:
oveclock your q6600 at least at 3.2 Ghz (higher clock better)
buy new GPU, 8400 GS is really not good for modern games. I sugget GTX 260(216) or 4870 1gb...at first check your PSU if it can feed such a GPU. Than you can go for medium/high setting with lowered view and detail distance at playable fps (35+)

I have gtx 275.intel core 2 quad 2.8ghz I play everything at MAX with no lag!but something stupid regarding GTA4 is the viewing distance in it!i mean come on the max is 30 for me!even people with gtx295 cannot go above 60 or 70!only solution is to get a graphic with 2Gb memory youtube.com/watch?v=MuwzO0ObVs4