Memory Distribution

It is important to distinguish between RAM (real memory) and Address Space. Regardless how much real memory you have as RAM or in the Graphics card - they all need address space. And a 32bit system can only provide 4GBs of that. So whatever memory you add with a graphics card will reduce the address space for RAM. Plus there are a few other smaller "users" that need address space - see here.
The situation is similar - but not the same - with an on-board graphics facility. It has no own memory and uses (shares) real RAM and, of course, address space.
 

My Computer

Computer Manufacturer/Model Number
HP, Dell, Gateway, Toshiba - 4 laptops and 2 desktops
OS
Vista, Windows7, Mint Mate, Zorin, Windows 8
CPU
from 1.6GHz Duo to i7
Monitor(s) Displays
2x HP w2207
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5x HDD, 7x SSD, 12x Externals
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with trackball - no mices
Mouse
Trackball mice
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DSL 6000
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So then what are the advantages of having more RAM on the Video Card. The only one I can think about is that the access speed may be faster than the main RAM
 

My Computer

Computer Manufacturer/Model Number
Proline
OS
Windows 7 Pro 64 bit
CPU
Intel(R) Core(TM) i7 CPU 870 @ 2.93GHz
Motherboard
H55-G43(MS-7638)
Memory
4GB
Graphics Card(s)
NVIDIA GeForce GTX 470
Sound Card
Onboard
Monitor(s) Displays
Proline LCD 19 inch
Screen Resolution
1280 x 1024
Hard Drives
2 x SATA 250 Gig 1 x External 2TB
PSU
RX 730 SS
Case
Proline
Cooling
Standard
Keyboard
PS2
Mouse
PS2
Internet Speed
To embarrassed to tell lol
True, access to video RAM is a lot faster than to main RAM - a world of difference.
 

My Computer

Computer Manufacturer/Model Number
HP, Dell, Gateway, Toshiba - 4 laptops and 2 desktops
OS
Vista, Windows7, Mint Mate, Zorin, Windows 8
CPU
from 1.6GHz Duo to i7
Monitor(s) Displays
2x HP w2207
Hard Drives
5x HDD, 7x SSD, 12x Externals
Keyboard
with trackball - no mices
Mouse
Trackball mice
Internet Speed
DSL 6000
Ok that is what I thought, so that clears up that one for me :D
 

My Computer

Computer Manufacturer/Model Number
Proline
OS
Windows 7 Pro 64 bit
CPU
Intel(R) Core(TM) i7 CPU 870 @ 2.93GHz
Motherboard
H55-G43(MS-7638)
Memory
4GB
Graphics Card(s)
NVIDIA GeForce GTX 470
Sound Card
Onboard
Monitor(s) Displays
Proline LCD 19 inch
Screen Resolution
1280 x 1024
Hard Drives
2 x SATA 250 Gig 1 x External 2TB
PSU
RX 730 SS
Case
Proline
Cooling
Standard
Keyboard
PS2
Mouse
PS2
Internet Speed
To embarrassed to tell lol
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