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Do APUs still have dedicated VRAM?

post #1 of 8
Thread Starter 
Doing an APU build and just want someone to confirm that the built in GPU functions just like a discreet graphics card (in this case, a Radeon 6550 on a BioStar A75), meaning it has its own VRAM and isnt going to saturate the RAM I put in it. I'm assuming it would, because otherwise, what's the point of an APU-- but just making sure...
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Clever Girl
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post #2 of 8
No, the built-in GPU uses system RAM, which is why memory speed is critical to video performance.

You can choose the amount of VRAM (up to 1024MB) you want taken away from system memory in BIOS.
    
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post #3 of 8
Apu's never had their own ram.
 
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post #4 of 8
Thread Starter 
So the amount is important as well? I was trying to decide between 4GB and 8GB of 1600 DDR3. I'm assuming the 8GB would be better (or a discreet GPU). Is 1600 fast enough?
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Clever Girl
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post #5 of 8
Yeah, it does pull from your system's memory and RAM speed does have an effect. Here's a comparison by Anandtech for the effects of different speeds of RAM, http://www.anandtech.com/show/4476/amd-a83850-review/4
post #6 of 8
Well, it depends on how much system RAM you want available.

My Llano rig is my HTPC, so I do fine with 4GB of DDR3-1600 RAM overclocked to 1866. If you can get 8GB at a good price, I don't see why you shouldn't do so. Most decent DDR3-1600 RAM can easily OC to 1866 anyway.

Take a look here at the impact of memory speed on GPU performance.
    
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post #7 of 8
Thread Starter 
Thx for the help smile.gif
Clever Girl
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Clever Girl
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post #8 of 8
I just read that when you "dual graphics" (basically Crossfire?) the APU with a discrete GPU card, the APU will use the VRAM on the card instead of your system RAM. Can anyone confirm this? *Feverishly looks on Wikipedia...*
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