2. You should try to get the same card if you want to SLI. If you get a reference GTX 470, your Gigabyte will have to underclock itself in order to match the reference GTX 470. Both cards have to run at the same clocks and frame buffer. You can try to overclock the reference GTX 470 to the same level as the Gigabyte, but you're safer off with another Gigabyte Super Overclock.
3. Depends on how fast new technology is produced. There's never a for-sure prediction. If the Radeon 6XXX cards prove to be a killer, there are chances that prices for the GTX 470 to drop as early as two months from now. Regardless, you should never force yourself to "wait for something better to come out so prices drop" since something new is always coming out.
Guys, what about PhysX?
You can add a second nVidia vidcard and designate it a PhysX unit...
But two GTX470, heheh
I have a single GTX460 1GB and it works nicely.
Thinking of adding something like a GTS250 as a PhysX card.
How does that work, do all games have PhysX?
Not to hijack the thread, but I'm looking at SLI too and asking the same questions as SpidermOn.
Not all games utilizes Physx. In fact, only a few amount of games utilizes Physx to a high degree. I wouldn't bother adding a separate card just to dedicate to Physx. SLI'ing a pair of GTX 460s will be much more efficient.
@mm: really? Wow, I didn't know nvidia stepped it up. As long as it's stable, kudos to them! I have yet to experience SLI since I can never keep myself from upgrading constantly...
ive been told a stock i5-750 could handle x2 GTX 470's. I myself have a GTX 470 oc'd to 800/1700 and plan on adding another one. My i5 is oc'd to 3.4ghz and should be plenty enough so you should be good
Dedicated PhysX cards are for when you upgrade your GPUs you leave an older one as a PhysX card, not add a new one for it
Yes, makes sense.
Unfortunately my old vidcard is a HD4870 1GB!
And I am finding my GTX460 1GB is not much stronger - at 1680x1050 it's really not enough.
I can't even run Call of Pripyat in DX11...
I should have got a 470!
Y'know, maybe the 460 would make a good PhysX card, heheh...?