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A comment on Which GPUs to Get for Deep Learning. Parent comment

Re:Which GPUs to Get for Deep Learning by wtallis on Monday February 23, 2015 @03:04PM (#9096639)
Less useful is an understatement: your working set simply cannot touch that memory region at all without crippling performance.
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Re:Which GPUs to Get for Deep Learning by dragontamer on Monday February 23, 2015 @03:58PM (#9096982)
That's true of any system. A "real" 4GB that touches the 4.1GB region will be forced to use CPU main memory over the PCIe bus.

So the 0.5GB region is still faster than PCIe IIRC. Not ideal of course, but still better than a bunch of PCIe transfers.

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