A question about Nvidia Pascal's unified memory

cbn

Lifer
Mar 27, 2009
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http://blogs.nvidia.com/blog/2014/03/25/gpu-roadmap-pascal/

According to the above blog and other info on the web Nvidia Pascal will have unified memory. This will allow the CPU to share memory with the GPU and the GPU to share memory with the CPU.

Does anyone see a problem with this working on Core 2 level hardware? Often times these machines ship with limited amount of RAM and being able to use the Pascal Video card's VRAM as System RAM would be a real benefit IMO.
 

ThatBuzzkiller

Senior member
Nov 14, 2014
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Nvidia Pascal's unified memory is useless for your desired effect ...

Unified virtual memory mostly only poses a benefit to heterogeneous systems such as APUs ...

Using video memory as a basis for the system is useless because it will end up been slower since paging from video memory will have a higher latency than system memory due to the fact that the described scenario would have to deal with PCIE bus latencies ...
 

RussianSensation

Elite Member
Sep 5, 2003
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Does anyone see a problem with this working on Core 2 level hardware? Often times these machines ship with limited amount of RAM and being able to use the Pascal Video card's VRAM as System RAM would be a real benefit IMO.
Why would anyone pair a late 2016 architecture with a July 14, 2006 architecture? I don't even....

We already know from user testing that Q9550 @ 4.0ghz bottlenecks a GTX570/HD7950. Considering GTX750Ti = GTX480 = GTX570, that means even the crappiest $150 Pascal chip will be bottlenecked by the fastest Core 2 Quad. I can't even comprehend who would be considering pairing a Pascal GPU with a Core 2 Duo/Quad CPU for gaming next year.
 
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cbn

Lifer
Mar 27, 2009
12,968
221
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Why would anyone pair a late 2016 architecture with a July 14, 2006 architecture? I don't even....

We already know from user testing that Q9550 @ 4.0ghz bottlenecks a GTX570/HD7950. Considering GTX750Ti = GTX480 = GTX570, that means even the crappiest $150 Pascal chip will be bottlenecked by the fastest Core 2 Quad. I can't even comprehend who would be considering pairing a Pascal GPU with a Core 2 Duo/Quad CPU for gaming next year.
I'm thinking the entry level Pascal cards, not the midrange ones.

Example: Cards that would be listed in this thread--> http://forums.anandtech.com/showthread.php?t=2403091
 

cbn

Lifer
Mar 27, 2009
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Using video memory as a basis for the system is useless because it will end up been slower since paging from video memory will have a higher latency than system memory due to the fact that the described scenario would have to deal with PCIE bus latencies ...
I think I see your point.

I believe NVlink is meant to be the answer to that problem, but needs to be supported on the CPU.
 

ThatBuzzkiller

Senior member
Nov 14, 2014
931
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I think I see your point.

I believe NVlink is meant to be the answer to that problem, but needs to be supported on the CPU.
NVlink only solves the interconnect bandwidth throughput issue, not the latency issue ...

NVlink/Omni Scale Fabric are meant to increase network traffic capabilities ...
 

destrekor

Lifer
Nov 18, 2005
28,708
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I think I see your point.

I believe NVlink is meant to be the answer to that problem, but needs to be supported on the CPU.
NVlink only solves the interconnect bandwidth throughput issue, not the latency issue ...

NVlink/Omni Scale Fabric are meant to increase network traffic capabilities ...
Ultimately, it's all really meant for the clustered compute world (think: GPGPU supercomputers). There will be a whole new GPU interface that replaces PCIe if Nvidia succeeds on this mission, but I don't think that will ever translate to the consumer market. I do think they'll adapt NVlink to replace SLI bridging, but it's not really shaping up to be a consumer tech push.
 

NTMBK

Diamond Member
Nov 14, 2011
8,677
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NVLink won't turn up in any Intel processor. If it's used for anything in the consumer market, it will be as an SLI bridge... but honestly, it isn't going to make that much difference. Latency is still going to suck.
 

Stuka87

Diamond Member
Dec 10, 2010
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Why on earth would you buy a Pascal chip for an Core 2 in order to get more memory, when its way cheaper to just BUY memory.

Not to mention it wont even work like that.
 

zlatan

Senior member
Mar 15, 2011
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http://blogs.nvidia.com/blog/2014/03/25/gpu-roadmap-pascal/

According to the above blog and other info on the web Nvidia Pascal will have unified memory. This will allow the CPU to share memory with the GPU and the GPU to share memory with the CPU.

Does anyone see a problem with this working on Core 2 level hardware? Often times these machines ship with limited amount of RAM and being able to use the Pascal Video card's VRAM as System RAM would be a real benefit IMO.
Pascal designed to support fine grained SVM with IBM Power8 architecture.

Coarse-grained SVM is already possible with OpenCL 2.0.
 

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