Hi All.
Win10 20H2 Pro
i5 4570, 8gb-Ram, MSI H81m-P33 mobo
NO GPU card - using Intel HD Graphics
In my BIOS I can set my:
* 'Integrated Graphics Share Memory' to 1024M (This 'deducts' 1GB from my general available Ram)
* 'DVMT Memory' to Max
From what I have found online, most say that these settings makes no difference, as the onboard graphics will use the Ram that it needs anyway, up to a limit.
My question: Why then even have these settings available?
Here is an article that does a pretty good job explaining this:
VGA Share Memory Size from The Tech ARP BIOS Guide! | Tech ARP
You may have those settings in your BIOS/UEFI however they have no use, except for confusion.
In general far too many settings are in MOBO BIOS/UEFI settings.
Mine with the same HD graphics does not.
'Integrated Graphics Share Memory' to 1024M (This 'deducts' 1GB from my general available Ram)
It does not, the allocation is dynamic up to the max set, pointless you may just as well leave it at 2 GB, which is the max for that CPU.
If an application requires say 0.5 GB then that is what is shared, the rest is available to other applications.
'DVMT Memory' to Max, All that means is the shared VRAM(shared) would be permanently set higher than needs be. That means less memory for the application, not good.
I have a Lenovo AMD laptop. Part of the main memory is assigned permanently to the GPU. This memory can be selected in the UEFI Setup as 1 or 2 GB, via an option called "UMA Buffer Size". The default size is 2 GB.
If the main memory is 8 GB, and the default UMA Buffer Size is used, the effective size of the main memory for general use is reduced to 6 GB.
To put it simple there are two places to set "Dedicated Memory" a.k.a "Fixed Segment" for Intel GPU , the Bios and then Windows Registry (by modifying driver settings) which then can over-ride the Bios setting in case it was assigned a higher value (the higher value set in both wins) .
Maximum memory the majority of Intel GPUs can handle is around 1.75 GBs , this figure is the sum of dedicated & shared memory Intel can abuse from your total ram in case were needed by memory hungry games (filled with textures) .
Dedicated memory was initially implemented by Intel to lower "Tearing" and "Input Lag" as shared memory is usually fragmented resulting in slow data retrieval .
Due to the advancements memory speeds have witnessed over the years , fragmentation became no longer an issue as data retrieval speed became faster than to cause any issue .
There had been an ancient rule of thumb , that if you plan to use 1920x1080 resolution all the time then you may need to set your Dedicated Memory portion for Intel GPU to 128 mbs , yet for 4K you might need to raise that to 512 mbs and the higher you go probably the more memory you should dedicate (However no valid explanations were given as to why exactly , where people defaulting dedicated memory to 64 mbs were never bothered by any issues) .
Last edited by nIGHTmAYOR; 25 Aug 2021 at 00:54.
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