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Sandy Bridge iGPU

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  • CPUs
  • Sandy Bridge
  • Intel i5
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January 12, 2011 5:22:29 PM

I am all set to purchase an i5 2500K, but wondered how much memory I can allocate to it to the onboard GPU?

The reason I ask is that the manual for the Asus P8H67-M Pro states that it can allocate up to 128M for the iGPU. This seems a bit low to me, so I am wondering if it is correct or not?

More about : sandy bridge igpu

January 12, 2011 5:51:08 PM

1965ohio said:
http://www.asus.com/product.aspx?P_ID=oztxS9uaDrwQwO2Y

Asus website says Maximum shared memory of 1748 MB

Where are you seeing only 128M?

What page of the manual? I downloaded it but cannot see that limitation.



Thanks for the reply, that sounds more like it. I downloaded the manual and on page 61 (section 2-19) it says 32M, 64M, 96M or 128M.
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January 12, 2011 5:54:08 PM

I was also wondering how it works with Dual Channel memory. Does whatever you allocate to the iGPU get shared equally between the DIMM's that are installed?
a b à CPUs
January 12, 2011 6:00:43 PM

I know what it could be. 32-128MB of dedicated memory and the rest is dynamic. Before I installed the graphics card on the board I have now, the internal graphics was the same way... let me choose 32-512MB, or set to AUTO. I have an ASUS M4A88T-M/USB3... it is an AMD board, but I can only dedicate 32-512MB of memory to the internal graphics processor, but the board can dynamically use up to 1GB.

I have 8GB of RAM, if I dedicate 512MB to it... windows will report 7.5GB... if I set it to AUTO, windows would report I have 8GB of RAM but directx dxdiag would say 1024MB of shared video memory available.

Since I added the GTX465, I turned off the internal GPU and those numbers do nothing now. I think your board is the same way... because the specs page says directly...

VGA Multi-VGA output support: HDMI, DVI-D, RGB port
Supports HDMI with max. resolution 1920 x 1200@60Hz
Supports DVI with max. resolution 1920 x 1200@60Hz
Supports RGB with max. resolution 2048 x 1536@75Hz
Maximum shared memory of 1748 MB
a b à CPUs
January 12, 2011 6:02:53 PM

I don't know how it will share the bandwidth... but I think page 61 is just showing you about how much RAM you can always dedicate.
a b à CPUs
January 12, 2011 6:03:01 PM

HyperFred said:
I am all set to purchase an i5 2500K, but wondered how much memory I can allocate to it to the onboard GPU?

The reason I ask is that the manual for the Asus P8H67-M Pro states that it can allocate up to 128M for the iGPU. This seems a bit low to me, so I am wondering if it is correct or not?

I have a Asus P8H67-M EVO and that is exactly what I see in EFI. 128MB Max.

To add a little confusion, Asus' Specification for my board mention 1748MB: P8H67-M EVO Specification (for some reason I can't see the PRO page.
Quote:
Maximum shared memory of 1748 MB


The wikipedia article for Intel HD Grahpics mentions a technology called DVMT. The Dynamic Video Memory Technology appears to grab memory as needed and give it back to the system. This must be upto the 1748MB Asus quotes.

The Mobo Manual says
Quote:
iGPU Memory [64M] - Allows you to allocate a fixed amount of system memory as graphics memory. Configuration option: [32M] [64M] [96M] [128M]
If you use the Multi-Monitor, it looks like there is an override and 64M is used.
a b à CPUs
January 12, 2011 6:05:23 PM

Also another note about the iGPU memory setting, perhaps this ASUS board has something similar to the new AMD boards... some of the boards have their own sideport dedicated memory that you can use before you borrow from your main system ram. That is also a possibility. Before you buy, try to give Asus a call or email... they are usually pretty quick about replies... 24-48 hours by email for me usually.
a b à CPUs
January 12, 2011 6:08:10 PM

That is what I was getting at before... like jpmucha said... my first assumption I think is right. Because when I dedicated 512MB... it would subtract from my main system RAM, but DXdiag always shows more available.
January 12, 2011 6:25:12 PM

It makes sense that it would be just a base setting in the BIOS. I suppose it is more efficient with the dynamic use of memory, even if not ideal in certain circumstances.

Thanks for the replies guys.
a b à CPUs
January 12, 2011 6:30:29 PM

You're welcome. And hope your build goes smoothly! :D 
a b à CPUs
January 14, 2011 3:55:54 AM

Hope the system runs well for you!
!