Windows 7: Is there a workaround to use all 4GB of RAM?

Thought I'd read somewhere that thwere is a tweak to let Win Home Prem 32 bit access all of the installed RAM? Or was I dreaming?

the 3GB boot option allows applications to address more ram, but limits the IO to 1GB.

it does not however, expose any more ram to the system. Windows will see anywhere between 3.0 and 3.75GB's of ram depending on the hardware in the system, as each device requires physical memory due to the 2GB addressing limit under a 32bit OS.

Mine sees 3764 Mb with 64 bit..

Thats because you have a 64bit OS....

bilzmale, instead of trying to get things working like that on 32 bit using PAE do yourself a favor and just go 64 bit.

And with the missing ~332 MB (odd number) probably allocated to the video chip integrated into the CPU.

OK if I add a video card with say 1GB memory will that allow the rest of the system to access more of the 3GB it sees (hopefully giving some speed advantages in progs like Photoshop and Lightroom).

No. 32 bit OS with 4 GB of ram and a video card with 1 GB of vram on it, will maker it that at best the OS will see and be able to use 3 GB.

^correct, in order to map the additional memory on the video card, the system will lose more system memory.

Yes you are dreaming. The 32bit system can only address 4GB (to be exact it is 4GB minus 1 byte) of address space and any device/function of the system that requires address space has to be mapped into these 4GB. Some of it is explained in this article, but if in addition you have a graphics card with address space requirements, that goes against the 4GB too. In a bad case you can end up with only something between 2 and 3GBs that remain for the OS.

OK I didn't make myself clear - I was comparing onboard graphics sharing system RAM with a dedicated video card.

Have done some searching and found a few things - I'd be interested in comments.

Memory Reamp in BIOS. I suspect this is a typo and should read "remap".

Patch kernel. A Russian hack.

Create a RAMDisk. A software solution.