Vista 64 Bit Only Shows ~3GB?

vista reads 4, try dxdiag if that reads 4 than who cares about the task manager neways, plus from the looks of how it read 3.3 it might be stuck in xp pro. vista is full of junky 1 in a million little problems like that. my vista when it reads available memory it shrinks by the hour, the memory is still there just vista seems to think its taken up. vista is simply put junk.

My physical Memory (MB) - Total = 4094 for me.

Really don't know why yours is less than that.

It's not a problem... it's a limit of 32-bit memory addressing. However, the OP is using 64-bit Vista... sooo...

With BIOS memory remap disabled what does Vista show in Task Manager?

Heres my experience with this issue whether totally related to either ASUS M/Bs, or ASUS M/Bs with Nvidia chipsets I'm not sure about that, only the tests I've run relating to my experience is what I'm sharing here.

It seems in what I've discovered so far that the issue is directly related to the memory remapping BIOS feature, when memory remapping is disabled on my M/B in Vista64 I show 2.5G of memory available to Vista, the missing memory is reserved for any components that have onboard memory, in my case I'm running 2 8800GT in SLI each card sporting 512mb of onboard memory, so automatically 1,024mb of system memory is reserved to cover the use of those cards, don't ask me why? I don't know why the M/B reserves this memory for cards that have their own onboard memory, but it does!!!

If I drop to a single 8800GT the memory available to Vista is 3G.

So obviously as with I'd guess most of you, you want the full use of your memory you've paid for, even though you're actually getting it, but you don't realize it, so as for myself I enabled the memory remapping feature in the BIOS setup and Wallaah, Vista64 showed the full 4G available to it, so my thoughts were, wow my performance has to have increased because of this, so I ran benchmarks to test this new developement out, well?

I was disappointed to discover my benchmark performance had seriously!!! Declined???

I challenge you to do your own testing!

Vista64 with 4G available of system memory by enabling BIOS Memory Remapping Feature, 3Dmark06 score = 8,998
Vista64 with 2.5g available of system memory by disabling BIOS Memory Remapping Feature, 3Dmark06 score = 11,744

Thats a 2,746 score difference on the same machine, that seriously affects gaming, which is what 70% of my computer use is all about!

Disabling memory remapping definitely is a performance booster even though in my case Vista can only use the 2.5G.

The full 4g of memory is actually available, just some of it is reserved.

This is my discovery, on my computer, the whys and wherefores, I don't know nor do I care!

So for what its worth I hope this information helps someone! Ryan

On my Asus mobo A8n sli deluve, you have 2 options to remap memory in mobo Bios, hardware and software, you have to disable hardware and enable software remap over 4 gigs. It should all show then.