Questions ... 1) both P5B-VM and P5B-VM DO motherboards have

Questions ...
1)
both P5B-VM and P5B-VM DO motherboards have 4 memory slots, 2 + 2 dual channel.
The maximum memory declared for these cards is 8GB (2GB x 4).
who determines the amount of memory managed by the card?
I mean, first it's definitely the hardware chip, after the bios, and finally the operating system (in my case XP).


Because I found a patch for XP that installed allows me to see up to 64gm of memory.
How can I tell if that card can handle 4GB banks or even 8GB? for a total of 16 / 32gb.
Is it the chip that manages it that imposes the limit or is it the bios? so can a modified bios extend the addressing?
Actually i install to try 5gb 2x2Gb + 2x 500mb.

2)
both cards have 2 PCIe, one X16 (for a video card higher than the one installed on the motherboard (GMA 3000 intel 2048 x 1536), and one X4 for i don't know what.
The problem is that seems PCI 1.0 the initial version.
Since I read that the PCI express slots are retroactively compatible, and since the current cards are also optimized for power, in the sense that they make more and consume less, it is possible to install a card that allows me to connect a 4K 3840 x 2160 monitor or 4096 x 2160? with drivers for XP ...
instead of the 2 monitors that I currently have (CRT 19 "1024x1280 actually set to 85Hz) I would like to take a bigger one, a 43", that the greater the definition, the less cumbersome it is and consume less.
I don't need it to play, I don't need extreme performance.
I should use it as a "desk", as if they were 4 screens 1024 x 1280) type to use a window on office, one on excel, one on the browser and another other program without each time resizing the windows or opening and closing programs.

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