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I'm definately buyin a 4200, i've been waiting for a hella long time for a new card, even resisted the gf3's but this i can't anymore@!
Currently using an ATI 8mb pci card on my 450MHz beast :| >>
GF4 Tis are largely CPU intensive (much moreso than GF3s) - I've seen some reviews quoting that if you don't have at least a 1.3Ghz chip to feed it, you're not gonna see stellar improvements speed-wise. Plus, if you're running a 450, that means you're most likely running a i440BX chipset-equipped motherboard, which is only capable of AGP 2X speeds...the GF4 has over 60 million transistors in it, over twice the number in your P2/P3...I can almost assure you that in all cases, the card will be working at less than 30% efficiency waiting for the 450 chip to draw enough polys to render the image. Plus, in my old 440 board, the AGP spec isn't 2.0, so voltages are iffy. 4400s and 4600s are supposed to be low-voltage cards, but the 4200 uses a GF3 power design, which requires much more juice.
TCWO seems to be giving some damned good combo deals recently...you might wanna delegate that 450 to being a file server or secondary box and upgrade. You should be able to get this card plus a mobo/chip and ram for less than 500 bucks and see a HELLUVA lot of improvement.
Hope this helps. I just didn't wanna read your reply without giving you some advice.
EDIT: Found this particular combo in another thread and thought it decent to post.
Pretty decent deal.