AGP wattage consuption

[DefKev]

For exemple, does a agp8-card in an agp8-board take less wattage when running at agp4/2/1 instead of 8 ?

 

[UncleMacro]

It consumes only a tiny bit less wattage running at AGP 4,2,1 instead of AGP 8. The GPU and RAM consume almost all of the power and they are running at the same speed independent of the AGP transfer rate.

 

[DefKev]

I know that the core/memory-clock doesnt care about the bus-speed, the difference between agp-4 (1017 MB/s) and agp-8 (2034 MB/s) is (so far) nearly unnoticable in daily usage.

The mature reason for pcie (x16, 4068 MB/s) is less the bus-speed, offcourse ... when your are going to run a sli-setup (x8x2) it starts to matter, its more (right now) the wattage which can be provided directly through the slot without the need of an external power adaptor:

AGP: ~35 watt
PCIe 1.0: ~150 watt
PCIe 1.0a: ~ 175 watt

Anyway, i was thinking about this earlyer this week and could find an answer on my own, so thanks for your reply !

 

[pxc]

AGP: ~35 watt
PCIe 1.0: ~150 watt
PCIe 1.0a: ~ 175 watt

It's actually closer to 30W usable on AGP and 75W on a standard PCIe x16 slot.

There is a separate PCIe 150W spec, but no motherboards use it yet. http://www.pcisig.com/specifications/pciexpress/graphics

 

[DefKev]

I was sure it was somethink about 75 watt but wasnt really sure if it was as high as 175 instead of 75 ... thanks !