geforce fx 5900 flashen naar een geforce fx 5950 ultra \ VOGONS

geforce fx 5900 flashen naar een geforce fx 5950 ultra

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First post, by egbertjan

Posted on 2025-08-15, 23:36

egbertjan Offline

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I've read several times online that it should be possible to flash the BIOS of a GeForce FX 5900 with the BIOS of a GeForce FX 5950 Ultra, so you get the performance of the GeForce FX 5950 Ultra with a GeForce FX 5900 card. I believe the GeForce FX 5900 Ultra and the GeForce FX 5950 Ultra are simply GeForce FX 5900s, just clocked a bit higher. Has anyone here done this?

If this is possible, could someone tell me how to do it and where I can find the BIOS for a GeForce FX 5950 Ultra?
I have an Asus V9950 GeForce FX 5900.

Reply 1 of 2, by Socket3

Posted on 2025-08-16, 07:28

Socket3 Offline

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It's not possible. The 5900 (non-xt) is based on the NV35 GPU. The 5950 Ultra is based on the NV38. If both cards would be based on the same GPU, then flashing would be possible, but you'd be overclocking the card's vram witch is already stretched to the limit of what GDDR can do speed-wise. Also, the Ultra has a 256MB frambuffer, while most (if not all) 5900's, including your Asus V9950 have 128mb of video ram.

You can flash a 5900XT into a 5900 since they are both based on the NV35 chip, since the major difference between the two is the video memory, but that implies a significant vram overclock, from 700MHz (what the XT runs at) to 850. I don't think I've ever seen an XT card capable of that overclock.

Running video memory out of spec like this, particularly GDDR will damage it in the long run leading to artefacts. Besides, there isn't much performance to be gained by doing such a mod - it's really not worth damaging the card for a (+/-) 10% increase in performance.

5900: https://www.techpowerup.com/gpu-specs/asus-v9 … r-edition.b1801

5950 Ultra: https://www.techpowerup.com/gpu-specs/geforce … -5950-ultra.c79

Reply 2 of 2, by The Serpent Rider

Posted on 2025-08-16, 07:54

The Serpent Rider Offline

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NV35 and NV38 are essentially the same GPU. No need to flash though, it doesn't add anything you couldn't do with simple software overclocking.

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