Can You Fill All Ram Slots

 
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 Slot

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I am doing all the research for my first custom computer build. I have read alot about memory configurations but am still needing clarification. The motherboard I am choosing is the Asus Maximus IX Code. It is dual channel compatible. There are 4 memory slots on the board. I want to have a total of 32GB or ram. 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. No, will be better w/ 4x8GB, less stress on the MC (memory controller) with only 4 sticks and ever so slightly better performance, only fill all slots if maxing out the DRAM ASUS Deluxe, max RAM is. They're there for a reason. However, I wouln't fill up every slot if I don't need the ram. That's just wasting money. Also, when installing more RAM, you gotta make sure to put it in the correct slot.

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 don't have to fill all the slots. Let's say I only want to buy two sticks of this to start off with (mostly for cash flow reasons), will the system work with only one stick for each CPU? What are the allowable Ram stick allocations assuming I only use 32GB sticks? For example 1 stick for each CPU, 2 sticks for each CPU, 4 sticks for each CPU? EDIT: The CPU and Motherboard support 256GB of RAM.
Would I be better off getting 8x 16GB sticks and being done with it?
RAM info:
Samsung DDR4-2133 32GB/4Gx72 ECC/REG CL15 Server Memory M393A4K40BB0-CPB