An Asus A7V would never fit into a Compaq case, it's too big. Even if it could it would likely run too hot ... just like all the Compaqs that have a *tiny* case fan and only a heatsink with no fan on the processor.
If you have a Compaq AMD k62 350 I'll bet you have a board using a Super Socket 7 (100 MHz fsb) and using either an ALi or SiS chipset. I just did some work on a Compaq Presario 5070 which used what appeared to be a cobbled version of a Sis Chipset driven board.
I've seen SO much corner cutting recently that I feel guilty telling anyone to buy a name brand computer. (Ex: Dell selling 1.5 P4s with TNT2 M64 video cards built in! Athlon 1200 DDR systems with 5400 Rpm hard drives! Compaqs seem to have this "Shared system/video memory" setup which basically means they don't have an AGP port and system ram is always been used as slow video memory.)
If I were building a performance system right now I would use: Asus A7V133 or A7M266 (DDR Chipset), 256 MB PC 133 Cas 2 (Crucial) on a7v133 or PC2100 DDR ram on the a7m, IBM 7200 rpm ATA 100 30 or 45 Gig drive (this is a MUST, absolutely the fastest, quietest drives yet made that aren't scsi), GeForce 2 GTS MX or Ultra, SB Live! Value or Xtreme Gamer, Thunderbird 1200 (133 Mhz FSB version), Alpha FOP32 cooler for Tbird, Sparkle or Antec 300W power supply in a well ventilated case. I can guarantee that this system will outperform any name brand system.
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bloom25
THUNDERBIRDS