AGP 1.0 slot - best vid card to use???

[rimshaker]

The original AGP slot only does 1x/2x and uses the higher 3.3V specs. Most modern vid cards still use a universal AGP connector so it will still fit, but the system won't power on due to improper voltages. I tried it with a 5600U card.

So what's the fastest card out there to use on an old mobo (Asus P2B) with an AGP 1.0 slot?

 

[Peter]

That's not due to improper VOLTAGES, but rather due to insufficient POWER.

Try a Radeon 9200. Anything faster would twiddle its thumbs waiting for the slow CPU most of the time anyhow.

 

[rimshaker]

Hmmm.. i follow your train of thought, but wouldn't the voltage spec be more of an issue rather than power? With 3.3V on the old board, should be enough wattage coming through there...plus there's that external PSU connector on that 5600 Ultra card. All the new cards running AGP 4x/8x use a much lower voltage spec of 0.8/1.5V.

 

[Jeff7]

I didn't think that AGP 3.0 was compatible with AGP 1.0. I don't know much about these Universal Slot cards; the name indicates (duh) AGP 1 - 3 support.
If it was in fact due to improper voltages, I imagine you'd have a fried videocard now.

 

[rimshaker]

Originally posted by: Jeff7
I didn't think that AGP 3.0 was compatible with AGP 1.0. I don't know much about these Universal Slot cards; the name indicates (duh) AGP 1 - 3 support.
If it was in fact due to improper voltages, I imagine you'd have a fried videocard now.

Should'nt get fried or anything.. just won't turn on. There's always voltage protection circuitry somewhere.. both on the card and the motherboard.

 

[PJABBER]

I have an older FIC SD11 MB with AGP 1x/2x that never seems to kick in the 2x.

Wound up upgrading the Radeon 7200 I had in there to a retail version Radeon 8500 (275 core / 275 mem with 64MB.) The 8500 runs perfectly and there are a lot of them for sale at around $45. Just make sure that you get the full 275/275 configuration and not the lower clocked SE versions (though they MAY overclock.)

I learned the hard way that there are like 8 flavors of AGP out there so make sure that you know what fits your MB.

 

[Peter]

Originally posted by: rimshaker
Hmmm.. i follow your train of thought, but wouldn't the voltage spec be more of an issue rather than power? With 3.3V on the old board, should be enough wattage coming through there...plus there's that external PSU connector on that 5600 Ultra card. All the new cards running AGP 4x/8x use a much lower voltage spec of 0.8/1.5V.

Once again folks - that 1.5V vs. 3.3V is the SIGNALLING voltage, nothing to do with the SUPPLY voltage. The latter is and always has been 3.3V; AGP 2.0 specification just raised the power budget there.

So:

AGP 1.0: 3.3V signalling only (1x/2x modes), rather weak power supply.

AGP 2.0: 3.3V signalling (1x/2x modes), _optional_ 4x mode w/ 1.5V signalling. Stronger power supply to the AGP slot.

AGP 3.0: Introducing 8x mode (1.5V signalling w/ reduced voltage swing).

In all those standards, implementation of certain modes is entirely optional, the exception being that 8x support always has to bring 4x support along.