thing is todays memory modules mat not be compatible with your older chipset motherboard ..
kinda like what explained here in this ?
Hi, I'm Jewel with Kingston Technical Support and would like to offer our assistance. It is possible that the HyperX 4GB memory modules are Single Rank as the latest builds of that part number are Single Rank. Up until recently 4GB modules were standard Dual Rank. Basically, the issue that can occur is that the memory module uses high capacity individual memory chips (DRAM) that the motherboard is not equipped to recognize. Usually, if a motherboard is able to recognized standard 8GB modules it should not have an issue recognizing Single Rank 4GB modules. A "1R" may be printed on the label which would indicate it as single rank. Otherwise, we can confirm this based on a reference number printed on the memory label that we can look up in our system. Other common issue with the DDR2/DDR3 combo motherboards that can be overlooked is that it only supports DDR2 OR DDR3 memory. This means you cannot have both DDR2 AND DDR3 memory installed at the same time, it is an either/or option. We do not currently support your PFG41C-M LX motherboard as we no longer manufacture memory that would be compatible with that motherboard. For any further assistance, please call us at 1-800-435-0640 (USA and Canada only) M - F 6am - 6pm PT and I or another available Technician will assist you. Please be sure to have the part in question on hand when you call.
what ever brand to decide on maybe best to contact there support to see what they say or still got that will work ??
your boards not listed [g31m-gs is ]
http://www.kingston.com/us/memory/search/options/
I don't see it here as well??
http://www.gskill.com/en/configurator?manu=52&chip=0&model=0
lot of guys run into this trying to upgrade to new memory to find it may not work
read what sands of time had to say here as well [ about rank1- or rank2]
http://forums.tweaktown.com/asrock/61610-asrock-g31m-s-r2-0-problems-handling-8gb-ram-specified.html
your just getting bad dated and old
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