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nVidia Tesla M40 Full 24 GB BIOS?

Joined
Feb 28, 2020
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I currently have an nVidia Tesla M40 12 GB that I use for various tasks, however I noticed that in nVidia-SMI only around 11.5 GB of VRAM is available. Task Manager in WDDM mode confirms that too even stating that some VRAM is "hardware reserved". I later noticed that right here on TechPowerUp there exists some alternate 12 GB BIOS versions. Apparently the 24 GB variant is in a similar situation, only apparently having roughly 22.5-23 GB of VRAM. However there's no full 24 GB BIOS on this site for the M40. So I'm wondering how these alternate BIOS versions work. How can there be 11.5 and 12 GB BIOS for the M40 12 GB? And is it possible to also modify the BIOS of the M40 24 GB to have the full 24 GB available?
 
Joined
Oct 22, 2020
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Many "pro"-series cards have a disable/enable ECC setting available in several places including Nv Control Panel.
Enabling ECC tunes a flag in a special part of VBIOS. With ECC enabled some VRAM is reserved for ECC functionality.

So actually with a control panel you can switch the normal and ecc-reserved states on any VBIOS. So, this memory reserve is more user-configurable than VBIOS-dictated, even if it is actually stored in the VBIOS flash IC.

Btw, disabling ecc would lead to better performance, consider this option.

ECC is really needed only for very specific taske, not for AI/rendering/gaming/mining
 
Joined
Feb 28, 2020
Messages
11 (0.01/day)
Many "pro"-series cards have a disable/enable ECC setting available in several places including Nv Control Panel.
Enabling ECC tunes a flag in a special part of VBIOS. With ECC enabled some VRAM is reserved for ECC functionality.

So actually with a control panel you can switch the normal and ecc-reserved states on any VBIOS. So, this memory reserve is more user-configurable than VBIOS-dictated, even if it is actually stored in the VBIOS flash IC.

Btw, disabling ecc would lead to better performance, consider this option.

ECC is really needed only for very specific taske, not for AI/rendering/gaming/mining
Oh perfect that did the trick thanks! I had no idea that was a setting, kept trying to find info on it for several days now but all I could find was those different BIOS versions.
 
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