...I still am having a few doubts with the GTX 670 Vs HD 7950, especially with the upcoming price-cuts. There are a lot of people on the web who, I see, have mentioned that it is a very overclock friendly card achieving speeds upto 1200MHz. At these speeds it does perform better than a 670
If the card will do 1200M then you're good to go - I don't think anything is guaranteed when it comes to overclocking. For a heavy OC you're definitely going to need to look at vendor designs rather than reference - good cooling plus beefy VRM (Some of the newer cards skimp on components - the Sapphire Flex range comes to mind). If you're buying with OC in mind, skip the wannabe's on mainstream sites - hit the reviews and the enthusiast forums - you'll want to see validation with the card stressed. Anyone can clock a card through the roof and get GPU-Z validation in a 2D desktop enviroment (which is why it means nothing), and Anyone+their dog can say their card can do XXXXMHz
I wonder how an OC's 670 does in comparison to an OC'd 7950
Simple. Check around for
OC vs OC ( 670 vs 7950 or
670 vs 7970 ( which should equate roughly with an OC'ed 7950)
Also, people talk of the GTX 670 being bandwidth constrained in games such as Crysis, Metro 2033. Why?
The exception rather than the rule. Some games will happily fill the 2GB frame buffer and saturate the memory bus, but generally this happens at high res (5760x1080 for example) and/or a heavy use of full screen AA. You whack the I.q. to max on Metro 2033 ( by that I mean tessellation, depth of field and 4 x MSAA) and any card will suffer...unless you know anyone who enjoys playing a twitch shooter at
20 frames per second You'll notice that the OC'ed 7950 beats the OC'ed 670 by a massive 15.4% - tres impressive!!...until you notice that it's 19.65 fps and 17.03 fps.
At 1920x1080 you won't have any problem with the frame buffer or memory bus width that doesn't also affect any other single GPU card.
But then there are people who claim that SLI experiences less microstutter than CF so you might want to read up on that as well.
As an owner of HD 5850 CFX and GTX 580 SLI I'd be one of those people. I'd characterize microstutter on Nvidia cards to run from zero to annoying, and AMD from zero to infuriating. Plenty of info on the web.
ComputerBase do comparisons on occasion and
Tech Report have some very good articles -and most importantly, reproduceable results.
Personally I'd worry about getting the single card first. Not everyone is affected by microstuttering to the same extent, and not all games are bad - it's just unfortunate that a lot of shooter games are affected