Hi,
I have just built a new system, the specs are:
I7-6700
Maximus VIII Hero
HyperX XMP Predator 12GB 3x4gb 3000mhz DDR4
EVGA GTX Titan X Superclocked
Samsung 1TB 850 Pro SSD
Windows 10

I ran Both VRAM Memory tests and got these results:
DX9: 4064
DX11: 44960
DXDiag Approximate Total Memory: 18282

From what I've read online the DX9 test is the way to go for skyrim, but considering i have 12GB VRAM and 12gb RAM 4064 seems a bit low. Is this the correct amount? I ran the game using the Aprox. Total memory - 350 and Skyrim Performance Monitor listed an average VRAM usage of 3731mb and memory usage of 908 (Grim and Sombre Hircine and Skyrim Mod Combiner Textures).

Edit:
NVM, have just discovered the Memory allocation limit with windows 8 and 10. Awesome. Going to research the possibility of a Dual Boot.

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I7-6700
Maximus VIII Hero
HyperX XMP Predator 12GB 3x4gb 3000mhz DDR4
EVGA GTX Titan X Superclocked
Samsung 1TB 850 Pro SSD
Windows 10 / Windows 7 Dual Boot

Yes, that's a limit of memory, thanks for driver creators.

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i5-4690k, 16Gb RAM, GTX 1060 6Gb, X-Fi Titanium, Win7 x128
I am INFP, not the brutal, godamnit.

Hey, sorry to revive this if it's too old, but is the driver limitation surely only for Windows 8 and above? I freshly installed Windows 7 64 Ultimate SP1 and the 359.00 Nvidia drivers and the vramsizedx9 tool says 4032. Read this post and went back to 356.04 dev drivers, same amount... is there a known driver version that didn't have the vramsize limitation? Or is this something else?

My system specs:

CPU: i5 3570K OC @4.2GHz
GPU: GTX770 DCU2 2GB OC version
RAM: 16GB DDR3 @1600Mhz
SSD: 840 EVO 256GB

Nobody knows what makes this limitation, but for sure it applied for all win10 users. Regarding win7 - the same OS, same videocard, same driver may or may not have this limit. Probably something else triggers it or some previously installed driver version. Reverting back seems have no impact, so may be installing clean OS and then drivers from very old one by one till limit will be broken? Only driver developers have an answer, but not replied.

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i5-4690k, 16Gb RAM, GTX 1060 6Gb, X-Fi Titanium, Win7 x128
I am INFP, not the brutal, godamnit.

Thanks so much for your answer man I am installing a clean version of Win 7 Ultimate SP1 64bit again, will try first with the 353.06 driver first since it has the "kepler fixes" and see what happens next.

Thank you for your great work btw

PS: I can also confirm it has affected 3 of my PC's and 1 laptop all rocking Windows 8.1 64bit. (I mean it didn't happen after a new driver installation, but right out of the box).

UPDATE: Fresh install with 353.06 driver and the test tool again gives me 4032. So that is the amount I should type in I guess :/

No, old driver means very old, may be 314.xx or even older. May be users without limit had different nvidia card before and too old driver set something in registry (or somewhere else) amount of memory available. It's really hard to say without having rig without limit for testing, unfortunately i'm not that lucky person and any attempts to remove limit failed.

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i5-4690k, 16Gb RAM, GTX 1060 6Gb, X-Fi Titanium, Win7 x128
I am INFP, not the brutal, godamnit.