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Using a current vga card(GF4 MX440, AGP8X) on and old BX chipset motherboard, is it ok?

Consult the manufacturer's FAQ. Not many older chipsets support the voltage draw needed by newer cards.
 
I'm not really worried about the current draw, as it is only a MX card.
But I'm worried about the voltage provided to the AGP slot.
Looks like newer cards need a lower voltage that old mobos cannot provide.
Is it correct?
I cannot find the answer in the FAQs.
 
You will have to get the MB specifications.

Most older MB's don't work with newer video cards because of the different AGP standards and voltages.
You are correct in saying that the newer cards need a lower voltage. I think they are only 1.5v now.

In fact most new video cards won't even fit into the slot correctly.
 
As long as your board supports AGP 2X, I think it should be fine. But the larger concern here isn't so much whether or not it will work, its will you see any real benefit from it? You said you have a P2-99 CPU, did you mean P2-266? There were no P2-99 CPUs. In any case, ANY P2 will seriously bottleneck a modern video card ,so you really wouldn't get the full benefit of the new card. I'm running an ancient Radeon 32MB DDR and even it was seriously bottlenecked by my old PII-350. When I upgraded CPUs, the framerates in all the games I play went up by about 3x, so think what an old CPU would do to a faster video card! Fact is, your next upgrade should be CPU/motherboard/RAM before a new video card. You can get setup with a motherboard/XP 1600+/256MB PC2100 DDR RAM for less than $200, which is dirt cheap for a mobo/CPU/RAM combo. This will give you a huge boost accross the board (including video games), then you can start saving for a new video card. Speaking of video cards, when you DO get one, do NOT get a gF4 MX. All the gF4 MX card are is souped up gF2s. Nothing more. For a few dollars more ($72 at newegg), you can get a 64MB Radeon 8500LE that will leave a gF4 MX choking in the dust. Also, don't fall for all the AGP8X hype. AGP8X provides VERY little if ANY actual performance gain in video games. Fact is, we aren't even saturating the AGP4X bus yet.
 
ASUS P2-99 , which is a 440ZX chipset based board, uses the same PCB as the P2B.

You should be fine. The video card is auto-switching upwards to 3.3 volts. Normally you should only be worried with cards that demand 3.3volts from boards that are only capable of 1.5 volts, not the other way around.
 
Hmmn, so its a case of backwards compatibility, i.e. newer AGP cards will work on older AGP slots, but not the other way around? Is there a primer on this, AT FAQ man? 🙂
 
There's a lot of older cards which operate at 3.3 volts only. Most AGP1X and 2X cards are 3.3 volts only; all 3dfx AGP cards are 3.3 volts only.

Fully compliant AGP4X/AGP8X cards should default request 1.5 volts and be capable of using 3.3 volts.

That's the cards, lets look at motherboards.

AGP1X and 2X boards supply 3.3 volts only. Matches well with the cards. AGP4X boards are supposed to only supply 1.5 volts. Older AGP4X boards are capable of supplying both 3.3 volts and 1.5 volts, but Intel's Pentium 4 chipsets, i845xx, i850xx, implement the strict 1.5 volt specification.

There were cases a few months ago where supposedly AGP4X compliant cards requested 3.3 volts instead of 1.5 volts. These cards (before motherboard manufacturers built in protection), fried the motherboard chipset. Just about all motherboard manufacturers have implemented some sort of protection now, where there is either a diagnostic LED, or the board simply wont start if it detects one of these rogue AGP4X cards.

Because all AGP4X/AGP8X cards use both voltages, they are fine in all AGP slots.
 
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