I just see this review, thanks for the link (i read tomshardware everyday though). It's interesting. They beat each other. ATI made a nice breakthrough with its memory. But soon Nvidia will follow, or make another breakthrough...then ATi make another breakthrough and so on and so on and so on...
If you ask me about which display card is the good one, well, i can't give you the precise answer, sorry. ATi and Nvidia are good cards maker, they made their own breakthrough, capabilities and features, it's a competition for them. Now it depends on the applications, lets say, GAMES and most important BUDGET. Yes, I love GAMES, some games are optimized for ATI and some for Nvidia, if you look carefully on benchmarks result, you'll see that one time ATI win and one time Nvidia win. But mostly the games will run on both cards. But BUDGET ? this one i can't afford. 500$ or more display card just look too much for me. Besides that, technology will always advancing, as long as peoples still like playing Games, so there will be always a new and more advance graphics cards will born. Maybe today the benchmark said that 1950xtx is the best one, Nvidia will make another breakthrough soon...i don't know what... so the point is : You've got your budget, make sure your PC will run together with the card, you check everywhere for the benchmarks and comparison. If you are sure, then buy it. When you'll see another cards born, just don't regret it, then you can say you got a GOOD card.
Just you know, I'm using Asus P5P800SE mainboard, Pentium 4 D 930 3.0GHz, NVidia 7800GS AGP, 1 Gb Corsair ValueSelect RAM, 320GB Seagate 7200.10, Audigy2 ZS Soundcard, Plextor DVD-Writer, Aopen DVD-ROM, CoolerMaster RealPower 550watt Power Supply and a bended casing which i never close it. I'm playing Half Life 2, Ghost Recon, Battlefield 2, Hitman, Call of Duty 2, FEAR and some of tycoon/sim games. Those games runs very well on my PC with 1280X1024 resolution and high settings. I feel comfortable and enough with this PC, and i won't upgrade it in a 2-3 years. Windows Vista will run very well in this PC, i already tried the beta version. I'm just glad to see the technology is advancing.
Are we still talking about finding graphics card for your Dell XPS 400 ?
Or maybe you'll start to build your own build PC by begin with buying this 1950xtx ?
Overclocking can be done in several ways but the result is depending on several aspect too. Does your BIOS support it, does your mainboard support it, does your PC have a good power supply, do you have a good memory and processor, do you have a good cooling device and the last thing do you have guts to do it ?
If you do have good aspects and guts then do it with patience, just don't regret when you fried your processor, corrupting data on your HDD, malfunctioning mainboard and other problems, and be very happy and more careful if you are accomplished the overclock.
You can do an overclock by BIOS or by software such as Clockgen for overclocking CPU, and Powerstrip for VGA card. For processor, what they do is changing the front side bus of the CPU or changing the multiplier of the CPU into more higher but it's because most of processor are locked on their multiplier, so they will only play on front side bus.
For VGA card, Nvidia has it's own overclocking software, it is integrated on their drivers, usually they are hidden, but you can open it easily by using Coolbits registry. You can change your GPU clock and Memory clock easily.
I heard, Ati has the same features on their driver for overclocking.
I overclocked my Pentium 4 D 930 to 3.5Ghz, and my 7800GS to 425/1400Mhz. But i don't have guts to let them like that, i feel safe and better with their manufactured clock.
BTW, thank you for the compliment, i do know things about PC but i still need to learn a lot more.