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GF256 stuck at AGP 1X :/

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First post, by m1chelsen

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On my backup build, i noticed that the AGP bus speed is only AGP 1X.

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My build is:

Athlon K7 700MHz (Slot A)
ASUS K7M (REV: 1.04)
Asus GeForce 256 (AGP-V6600PRO/64M)
Creative Sound Blaster Live! (CT4830)
Creative Sound Blaster AWE32 (CT3990)
Realtek (RTL8931)
512MB SDRAM (PC133)
20 GB Maxtor

Dual boot: Win98se + Win2K

I have installed the 61.77 nvidia driver. I have installed the mobo drivers (4in1428v(a)) from the ASUS website, and some AGP driver pathces / fixes.

When i open the advanced settings for the display, it says: Bus: AGP 1X.

I have looked in the BIOS, but there are no options to change the AGP speed.

AFAIK, the mobo should support 2X and the GF256 4X.

I notice that the GF256 AGP connector (pro) is longer than the AGP port on the motherboard. I assume that the last pins effects the performance, but that the card is still compatible with the mothaerboard (it works fine). Does this "mismatch" limit it to the 1X speed?

Is it possible to run this build with 2X, and if yes, how do i set it to 2X?

[ Console collecting blog: www.KonsolTing.blogspot.dk ] // [ Retro PC trading blog: www.3DfxQuest.blogspot.dk ]

Reply 1 of 5, by m1chelsen

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I have just tried to change the GPU to a GF4 TI4200 (AGP 8X), but its still stuck at 1X.

[ Console collecting blog: www.KonsolTing.blogspot.dk ] // [ Retro PC trading blog: www.3DfxQuest.blogspot.dk ]

Reply 2 of 5, by Scali

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m1chelsen wrote:

I have installed the mobo drivers (4in1428v(a)) from the ASUS website, and some AGP driver pathces / fixes.

The 4in1 drivers are for VIA chipsets.
However, your board has an AMD-751 northbridge, which implements the AGP bus.
So you might have to look for a driver for that one.
The chipset and board should support AGP 2.0 at 2x speeds.

http://scalibq.wordpress.com/just-keeping-it- … ro-programming/

Reply 4 of 5, by swaaye

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It's the NVidia drivers forcing the cards to 1x for stability. You can force 2x with Rivatuner if you like but it will probably cause freezes. I think GeForce FX cards might work ok at forced 2x (probably best to get one with aux power connection). I tried GeForce 256, 2 Pro, 3, 4 Ti, FX 5200U/5900 and maybe 6800 on K7M a few years ago.

TNT1/2 will run at 2X by default and be stable IIRC.

The old GeForce FAQ claims some chipset steppings of AMD 750 work with 2X. Who knows. My board had Superfetch but was not stable at 2X with most GeForce cards.
https://web.archive.org/web/20090531040324/ht … rog=gef&lang=en

GeForce cards had stability problems on a lot of boards back then. Maybe excluding only Intel chipsets. AGP was just not very solid until around 2002 motherboards I'd say. NVidia and Intel are usually the most stable.

Reply 5 of 5, by matze79

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Depending of Revision of your Irongate Chipset you can force AGP 2x enabled.
But if you have a older revision you will run into problems.

Performance benefit of AGP 2x is questionable. Specialy on slow GF256 Cards.

https://www.retrokits.de - blog, retro projects, hdd clicker, diy soundcards etc
https://www.retroianer.de - german retro computer board

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