Q: I have 2 512 meg sticks of Corsair XMS Pro, they do not have to purchase a set. Trying to get them both working on my system. Not sure, but the model # I have a Gigabyte 939 MB. System will either DIMM in slot 2 or slot 4 itself. But when I try to boot with both, my system is installed in 512. The DIMMs have LED lighting, and I can see when both are installed, only one is blinking. Im going to assume there is some problem with the MB. But perhaps there is something I try not one of you are aware? I do not really want to RMA this MB unless whatever I have.
Best Answer: Have you prepared a floppy with your SATA and IDE drivers on it and pressed F6 just after windows boots from Your CD? If not Windows cannot read your hard drive. If you are loading Vista, drivers can be loaded from any source but in any case you have to extract the drivers from the driver disk to a form windows can accept. You should be able to find a file that says floppy drivers for SATA and IDE . Whatever media you use Floppies only for XP or something else for Vista you must load them at the particular time Windows is looking for them and you must press F6 when prompted to. The drivers are not the same for XP and Vista so if your manufacturer has not provided Vista drivers you must load XP.
Gary
Re:Hey guy,
I've had the exact same problem!! I posted my issue up just a day or two ago – still haven't been able to resolve it! Check it out here (http://{$MySite}/messageview.aspx?catid=32&threadid=1716778&enterthread=y) But basically, to quickly summarize:
I have a AMD64 3000+ (Winchester) on an ASUS A8N-SLI mobo with 2×256MB RAM. And on boot up, it only shows up as 256 MB installed. But it also mentions that it is running in Dual Channel Mode. On running some benchmarks – it seems that there is indeed a performance difference when I have the two sticks installed v/s just one (even though in both cases the system memory is reported to be only 256MB).
I'm equally lost as to what's going on. 
Jimmy
Re:The memory voltage. Those fancy modules are spec'ed to be run at 2.75 volts if I remember correctly. If the mobo defaults to 2.6V or even 2.5V, then crank the memory voltage up to where it belongs.
If you have a different, good-quality power supply around, try it instead. Maybe you'll end up retracting the statement that you've never had a problem with your X-Connect 
Re:Originally posted by: guy
Here are a couple more ideas:
1) did you remember to crank the voltage up to 2.8 volts? Don't run your Dodge Viper on 85-octane gas, now…
2) try removing the motherboard from the case to eliminate any possibility of case-related short circuits, if you didn't already. Lay it on a sheet of cardboard and test it that way as a fact-finding step.
3) what brand & model of power supply is towing the boat there, something of good quality and appropriate wattage?
1. up my CPU's voltage? my BIOS has a setting for memory, I can run it + .1 .2 voltage
2. good idea I hadn't thought of that.
3. Ultra X-Connect, I know people on here HATE this PSU, but I've never had an issue with it. I'm concerned memory won't run in slots 1 or 3 at all, that can't be good. too bad one of the dimms the info has faded off, has that corsair heatsink, and I can't tell nothing about it to see if it matches the other one.
Re:Here are a couple more ideas:
1) did you remember to crank the voltage up to 2.8 volts? Don't run your Dodge Viper on 85-octane gas, now…
2) try removing the motherboard from the case to eliminate any possibility of case-related short circuits, if you didn't already. Lay it on a sheet of cardboard and test it that way as a fact-finding step.
3) what brand & model of power supply is towing the boat there, something of good quality and appropriate wattage?
Re:I think something's wrong with the MB, if i put a single stick in the first slot, or the 3rd slot it won't boot at all. only slots 2 & 4 work. I will try some other memory if I can get my hands on some. I think Corsair has a lifetime warentee I should check into that
Re:Their logical addressing scheme may be different, making a 128-bit virtual data pathway impossible. Try putting both on one channel and see if you suddenly got all 1024MB available. If so, get a matching pair and sell the old ones off.
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