Romex Software Forum

PrimoCache can use the RAM above 3.4GB on 32bit systems.
I wonder if the same is true for 64-bit systems.
Some of Intel's i7 series, the whole i5 and i3 series can address "only" 32GB RAM.
Several motherboards support 64+GB.
Those motherboards existed even before the high end i7 series could address above 32GB.
I never was able to figure out what's the use of 64GB motherboards if only 32-bit can be addressed.
I contacted Asus support who gave a totally useless standard answer. The guy at Intel support seemed to be guessing big time too. His guess was that the memory would be paged. A bit similar like extended memory when 640KB was the standard.

So.... let's totally ignore the usefulness of such huge quantities of RAM and consider the following setup.
- i5 which can address 32GB.
- Motherboard with 64GB RAM.
- PrimoCache.

Will there be some performance hit on the visible 32GB?






32GB: http://ark.intel.com/products/65719/Int ... o-3_90-GHz

With 64-bit systems, "invisible memory" refers to anything beyond Windows' limit (e.g. 16GB with Win7 Home Premium). PrimoCache/Ramdisk should allow access to memory outside of such artificial limits, but can't do anything about motherboard or processor limits.

Having said that, the key phrase from that Intel spec sheet is "(dependent on memory type)" and I suspect the limit is really down to the number of memory modules the processor/motherboard can accommodate. In this case (future) higher capacity modules should raise the limit, as should an LGA2011 processor/motherboard with 8 DIMM slots available.