Can You Fill All Ram Slots

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Hi, When you purchase a computer, by default, it only has one RAM inserted and you have an option to expand the laptop's RAM by adding another one on the second slot. This explains why you only have one (1 of 2) RAM showing on the Task Manager. Let us know if you have any other concerns that we can assist you with. The motherboard I am getting (ASUS P5WD2) has four slots for memory, total of 8 Gig. I'm going to put 2 Gig in (need it for large video editing files) Am I better off to get 4 512s and fill all slots so if one goes bad I can replace at cheaper price or am I better off to go with two 1 Gig. To check the new RAM wasn't defective, I tried it in slot 1, a known good slot. All 4 sticks of RAM worked in slot 1, so the RAM wasn't faulty. All 4 sticks work in every slot except slot 2 (the first black RAM slot). If I put any stick in slot 2 - old or new - the PC is dead, it won't even boot to the BIOS.

Hi Guys,
I've got an Asus P5B Deluxe motherboard. Today I tried adding some new RAM to take it from 4GB to 8GB. The board is about 6 years' old. I've never used the black RAM slots before, only the yellow ones (2x2GB in slots 1 and 3).
My system only sees 6GB, not 8GB. I've tried various combinations of the RAM, get the same result.
To check the new RAM wasn't defective, I tried it in slot 1, a known good slot. All 4 sticks of RAM worked in slot 1, so the RAM wasn't faulty.
All 4 sticks work in every slot except slot 2 (the first black RAM slot). If I put any stick in slot 2 - old or new - the PC is dead, it won't even boot to the BIOS.
So it looks like I have a defective RAM slot.
Does anyone know of any way to fix this? The board is too old to RMA. I've tried an emery board down the defective slot, and I've tried squirting WD40 down it. No improvement.
Does anyone have any other ideas on how to get that bad slot working?
Thanks!
Can You Fill All Ram Slots

Do You Have To Fill All Ram Slots

I want to use 2 E5 2683 v3 CPU's with the SUPERMICRO MBD-X10DAL-I motherboard. The motherboard has 8 ram slots and supports 2133mhz DDR4. I am thinking about getting a couple sticks of this ram as it may allow for easy expansion to higher amounts of ram. I know with enthusiast grade hardware you. The slots don't need to be all filled if you want to install a 2gig of ram, i recommend you to buy 2 ram of 1gig!