Meh, it was two weeks ago today that I bought my new rig. At the time the 4870 was topping the 260 by something like 6% and was $20-$70 cheaper, but instead of logically getting the card which was both FASTER and CHEAPER, I got the more-expensive card borne of a behemoth GPU.
The reasoning behind the illogicality of such a decision?
A multi-faceted understanding.
1. Board Partners
Nvidia has the cream of the crop for board partners, Evga has a Step-Up program to help consumers cope with the rapidly changing GPU market, XFX has a sweet package outlined below, BFG makes solid cards/lifetime warranty, and MSI offers factory OC'd cards for very small (~$5-$10) premiums, and in general a higher bar of quality. Well, if you take the skizzy 8800GT launch coolers and current QC problems with chips, mobile GPUs, and their top-tier GPUs with a grain of salt.
ATI's partners, well, er, Powercolor I believe went bankrupt in past years and somehow re-emerged, and Visiontek doesn't support OC'ers/modders and has a SINGLE Lifetime Warranty, causing your reincarnation to not have any warranty (or whatever schmuck you sell the card to later), all of which es no bueno. HIS does make nice coolers, but only after the card has been out for a right long time in tech time. Most of the others simply goof off with competing sticker designs (did anyone check out Diamond's sticker on the 4850?). The lackluster performance of ATI's board partners is indeed hindering ATI's comeback and will until the board partners come up with GOOD and ORIGINAL ideas/coolers/anything but more stickers, gah.
2. Package Deals
My card is an XFX GTX260 factory OC'd to 640Mhz core etc. and comes with a modder/OC'er-friendly Double Lifetime Warranty, which is enough marketing drool to fill up your next bowl of cereal AND help you sleep better at night. Which is good.
O YA I got COD4 with my card. Yay.
ATI's board partners' "packages" have been talked about above.
3. Specs
The GTX260 offers a larger 448-bit memory bus, more VRAM, better power management, arguably more OC'ing headroom, and Physx/CUDA. People who have tried out games with GPU Physx had somewhat lower framerates, but a better gameplay experience. CUDA support combined with F@H makes Nvidia finally competitive with ATI on GPU-accelerated processing (for lack of a better term)
ATI's 4870 has GDDR5 (which is coincidentally a five-letter acronym), the standard 512MB VRAM, more stream processors than you (800), DX10.1 (which so far has indeed show at least some degree of usefulness), 7.1 audio over HDMI, and should sometime have Havok/Physx.
I would probably call this either a draw or a close win by Nvidia. ATI here is ultimately becoming competitive again, rather than superbly spanking Nvidia or pulling off something crazy. I have hope for even better products from ATI in the future.
I really wanted to get a 4870 or crossfire two 4850s. They are indeed compatible with the Acceleros, and they have good performance. The lackluster support from board partners and lack of any incentive, outside of price and performance, of which ATI's engineering is responsible, is what really killed the purchase for me. SLI is on Nehalem, I have a solid card that is quiet and cool, and if I were to SLI two GTX260s with an upgrade to Nehalem, I would have a formidable rig for a good amount of time.