Thanks for replies
Ill use these updates from mdgx site, i remember that i found them an year ago but were unable to find it back during this week.
Thanks for the tip on flash version too, probably this is the problem.
Anyway youtube videos are running even with flash10 installed
About dx9 and newer gfx cards, unluckily this is not possible, this is going to be a retrogaming pc, im using it for going on internet just because my main pc went on fire 2 times during the last 3 weeks (LOL

), so i really need the cards that are installed on (rendition verite v2200, 3dfx voodoo and Nec PowerVR)
Probably the only possible upgrades for not breaking compatibility with glide games are going to be 2 voodoo2 in sli (im already working for getting these

, but need to find shorter ones like canopus pure3dII, because reference design is too long for being installed on second pci slot, CPU heatsink would be in the way)
Lastest Dx upgrade that does not mess up old games is 7.x, but if i can keep it on running 6.1 atm is better, because Dx installations are some of the few things in life that last "forever" (until next format

), so i'll leave it as a last resort.
Other future upgrades will be:
- 120 gb hd ide (bios should support it - 3 partitions: Win98SE, Win95OSR2.5/not all win95 games run well on 98, Dos/still dunno which version, maybe 1 of the newer opensource forks)
- + 1 dimm 128 pc133 (so i can run it with low latencies at pc100)
- USB (if i get a compatible bracket)
-maybe a DFI K6bv3+/66 if ill find it at decent price
- Aureal Vortex 2 8830 chipset PCI for A3d 2.0 support (better if it is revision B like SQ2500 superquad, but this is really rare today)
- LS120 internal (in case i dont get usb working for fast file exchange, and because these are still some of the faster internal floppy disk drives around)
- Floppy 5.25" 1.2mb (for even older games, but need to find a recent version, or will be incompatible with 40pin floppy port)
Edit:
Just for clearance, this is the current config:
A robust AT middletower (2x5.25", 2x3.5" external, 1x3.5" internal)
450W ATX powersupply
DFI p5bv3+ rev b5 using ATX power
AMD K6 III+ 450@550mhz (like all k6plus it runs fine at 550)
256mb sdram (2x128) PC133 running at pc100
QDI Vision 1 - Rendition Verite V2200 8mb AGP2x (using 1.48bios + win9x official 3.0beta5 drivers)
Orchid Righteous 3d PCI 4 mb - 3dfx Voodoo 1 (using iceman modded 3.01.01 drivers /would like to find a skywell magic 3d 8mb :/ )
Matrox M3d 4Mb PCI - Nec PowerVR PCX2 (using Pvr revolution 4.1.3 modded drivers)
Creative Sound Blaster 64 Gold Isa Pnp
3com Etherlink III 509b ISA PnP
Seagate Barracuda II ata33 20gb + Maxtor 1,2gb
LG H10N ide (this thing read everything, even cd full of scratches or damaged, it's perfect for a retrogaming rig)
regular Floppy 3.5 (luckily for error i swapped the "original" 1996one with a 2001 one that i had on my main pc, because the old one caused a shortcircuit that burned the powersupply; in a little case like the AT one and with such an old powersupply on it if this shortcircuit would have happened on the retrogaming rig it would have burned all)