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8X on a dualie mobo

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bkbroiler

New Member
Joined
Nov 16, 2002
Location
MONTREAl
Any AMD boards with 8X AGP, I have a Asus A7M266-d right now but that only has 4X max, My ned redeon 9700 Pro has 8 X

Pleasew advise
 

cmcquistion

IT Director Senior
Joined
Oct 15, 2001
Location
Tennessee
bkbroiler said:
Any AMD boards with 8X AGP, I have a Asus A7M266-d right now but that only has 4X max, My ned redeon 9700 Pro has 8 X

Pleasew advise

8X gets very, very little performance improvement over 4X. It's in the neighborhood of 1-2% gain.

IFMU said:

I will agree that it will be very unlikly.
But, there is a new chipset out, you even posted in the thread I posted about it!
and to think Ive always thought my memory was short term! ;)

I think Sickboy was referring to another Athlon MP chipset, not Hammer.
 

bulk88

Member
Joined
Apr 25, 2003
Location
NYC
If you truly want 8x AGP. Replace the clock generator in the motherboard. The AGP clock isn't based off the FSB. IT has its own external clockgen, seperate from the FSB gen. so you can give it a 133 unit (from the 66 unit) and set the AGP multiplier to 4 (4x AGP) (133x4=533) and you have 8x. The only problem is that the 66mhz AGP clock gen also powers the 66mhz PCI devices (just without multipliers), AKA your AMD southbridge will now be feed 133mhz PCI. But if you have a VIA southbridge (686B) you don't have to worry because the northbridge has a seperate clock input for 33mhz PCI devices, that has nothing to do with the AGP clock. Basically double the AGP gen you get 8x agp and all your 66mhz PCI devices are disabled. Everything else remain the same. Also remeber that 8x uses a lower voltage (.8) but I think that if the card is backwards compatible to 4x (1.5) it should be tricked into doing 8x AGP with 1.5 by giving it a 533 clock.

Man I've been smoking some funny crack.