Little to nothing. If you read around some reviews, most just say to go with the cheapest as most don't veture from the NVIDIA reference design much, if any. The only differences are in a few cards that are designed to overclock. The two I think of are the Abit Siluro OTES which Sudhian reviews
here. It looks kind of nice, but the reviewer said that he thought the noise was too much.
On the other hand, you have the Gainward Golden Sample boards, which overclock better. Why do I say better? Well, the cores consistently get better overclocks. Any naysayers can just look to
Amdmb.com's Bits and Pieces column, which lists reviews from around the net. As far as the memory goes, the above review got a lower result, but like all other 128MB Ti4200, the memory is rated slower than the 64MB flavors. If you notice, he even states this, though actually, the Gainward's memory on their 128 meg cards is rated at 4.4ns, not 4.5, but who's counting, right? However, they do have a 128MB Ti4200 Golden Sample that has 4.0ns RAM in it, and another with 3.5ns RAM. This will most certainly get you to Ti4600 levels and beyond. Plus, Gainward bundles their cards with overclocking software. So, you buy a Gainward GF4 Ti4200 with 128MB of 3.5ns RAM, O/C it to Ti4600 levels, and you're good to go. The only problem is, the only 3.5ns card that I could find is from a seller I don't trust (United Micro), and it's $181 shipped. I've ordered this exact card from them before and got exactly what I ordered, but I'm hesitant to recommend them to anyone else.
Bottom line: If you're not going to overclock, I'd get a Gainward any way, because their base Ti4200 is basically the same price as the absolute cheapest one you can find ($125 shipped versus $109 shipped on
this Pricewatch.com page. It'll run cooler because not only is their stock card cooler very reliable, but they hand-pick their chips. Don't believe that they actually do that? How else do they consistently get such good overclocks? The point is, a cooler GF4 chip will last longer, just like any other hot part in your computer that you keep cool.
Gainward is also good to their customers as
this article over at The Inquirer. At the end of the article, he speculates that it might just be a PR stunt.... PR STUNT? That's like my friend that got fired from her bartending job for giving free drinks. She told her manager, "I pay for the drinks I give. I keep a list of everything I pay along with the receipts and
you have all of those." His answer? "That's just a cop-out."
As far as other options go, you can opt for the Golden Sample if you want it. It's only a slight increase in price ($149 from
here), and it'll get you to the speed of a Ti4600 for only slightly more that a regular Ti4200. Or, if you're a Video In/Video Out kind of guy, you can get the VIVO versions of the Gainward cards. Both the Golden Samples and the VIVOs are available in 64MB and 128MB flavors. Take your pick.
By the way, I'd stop by
Reseller Ratings befroe buying from any vendor. Better be safe than sorry. If you want to get around that hassle, just go to
Newegg.com and get whatever you decide on. Anyone in here that in the instances when their prices aren't the lowest on the web, they're very close to the lowest. Plus, they are probably the most well-respected vendor on the internet... period.