I've now cleared CMOS, but with no affect. I still get only 15Gb usable. I also tried changing the cards to the black slots, and used MemOK to get it to boot, but even still, only 15Gb usable. The CPU is an i5 2300 2.8 GHz. I have just won a bid on an i7 3700k 3.5 GHz, so I'll be putting that in shortly. The BIOS is already updated to the most current version. I just installed a new GPU, an ASUS Radeon R7 250 - 1 GB. The OS is Win7 Enterprise 64 bit. Since I wrote, I have been able to get 15GB usable out of the 16GB. While that's quite a bit better than 4Gb, I should be able to get the full 16. I had picked out all the components of this PC and when I built it 5 years ago, it was strange that the PC wouldn't boot with the two 2GB memory cards in the blue slots, which is where they should go if you only use two. The machine booted fine with the two 2GB cards in the black slots, however, except that strangely, computer properties as well as AIDA64 Extreme Edition showed 6GB RAM in use. I have never been able to find any explanation for that. Now that I put two 8GB cards in, they did not work in the black slots, but well in the blue ones, like they should. By reseating and swapping the cards, brushing & blowing out the slots, and playing with the MemOK button I went from 8GB usable, to 4GB usable, to now 15GB usable. The old RAM cards are Kingston KVR1066D3N7/2G and the new ones are Kingston KVR1333D3N9/8G. I already changed the settings in BIOS from 1066 to 1333. AIDA gives me the following information on the Motherboard, CPU and RAM:
CPU Type QuadCore Intel Core i5-2300, 2900 MHz (29 x 100)
Motherboard Name Asus P8H67 (3 PCI, 2 PCI-E x1, 2 PCI-E x16, 4 DDR3 DIMM, Audio, Video, Gigabit LAN)
Motherboard Chipset Intel Cougar Point H67, Intel Sandy Bridge
System Memory 15320 MB (DDR3-1333 DDR3 SDRAM)
DIMM2: Kingston 99U5471-052.A00LF 8 GB DDR3-1333 DDR3 SDRAM (8-8-8-22 @ 609 MHz) (7-7-7-20 @ 533 MHz) (6-6-6-17 @ 457 MHz)
DIMM4: Kingston 99U5471-052.A00LF 8 GB DDR3-1333 DDR3 SDRAM (8-8-8-22 @ 609 MHz) (7-7-7-20 @ 533 MHz) (6-6-6-17 @ 457 MHz)
More under the section Memory:
Physical Memory:
Total 15320 MB
Used 2647 MB
Free 12673 MB
Utilization 17 %
Swap Space:
Total 24481 MB
Used 2731 MB
Free 21749 MB
Utilization 11 %
Virtual Memory:
Total 39801 MB
Used 5378 MB
Free 34423 MB
Utilization 14 %
Paging File:
Paging File C:\pagefile.sys
Initial / Maximum Size 9162 MB / 13743 MB
Current Size 9162 MB
Current / Peak Usage 0 MB / 0 MB
Utilization 0 %
Physical Address Extension (PAE):
Supported by Operating System Yes
Supported by CPU Yes
Active Yes
SPD
--------------------------------------------------------------------------------
[ DIMM2: Kingston 99U5471-052.A00LF ]
Memory Module Properties:
Module Name Kingston 99U5471-052.A00LF
Serial Number 0E318A46h (1183461646)
Manufacture Date Week 8 / 2016
Module Size 8 GB (2 ranks, 8 banks)
Module Type Unbuffered DIMM
Memory Type DDR3 SDRAM
Memory Speed DDR3-1333 (667 MHz)
Module Width 64 bit
Module Voltage 1.5 V
Error Detection Method None
Memory Timings:
@ 609 MHz 8-8-8-22 (CL-RCD-RP-RAS) / 30-159-4-10-5-5 (RC-RFC-RRD-WR-WTR-RTP)
@ 533 MHz 7-7-7-20 (CL-RCD-RP-RAS) / 27-139-4-8-4-4 (RC-RFC-RRD-WR-WTR-RTP)
@ 457 MHz 6-6-6-17 (CL-RCD-RP-RAS) / 23-119-3-7-4-4 (RC-RFC-RRD-WR-WTR-RTP)
Memory Module Features:
Auto Self Refresh Not Supported
Extended Temperature Range Supported
Extended Temperature Refresh Rate Not Supported
On-Die Thermal Sensor Readout Not Supported
Memory Module Manufacturer:
Company Name Kingston Technology Corporation
Product Information
http://www.kingston.com/products/default.asp
[ DIMM4: Kingston 99U5471-052.A00LF ]
Memory Module Properties:
Module Name Kingston 99U5471-052.A00LF
Serial Number 9430DBB0h (2967154836)
Manufacture Date Week 8 / 2016
Module Size 8 GB (2 ranks, 8 banks)
Module Type Unbuffered DIMM
Memory Type DDR3 SDRAM
Memory Speed DDR3-1333 (667 MHz)
Module Width 64 bit
Module Voltage 1.5 V
Error Detection Method None
Memory Timings:
@ 609 MHz 8-8-8-22 (CL-RCD-RP-RAS) / 30-159-4-10-5-5 (RC-RFC-RRD-WR-WTR-RTP)
@ 533 MHz 7-7-7-20 (CL-RCD-RP-RAS) / 27-139-4-8-4-4 (RC-RFC-RRD-WR-WTR-RTP)
@ 457 MHz 6-6-6-17 (CL-RCD-RP-RAS) / 23-119-3-7-4-4 (RC-RFC-RRD-WR-WTR-RTP)
Memory Module Features:
Auto Self Refresh Not Supported
Extended Temperature Range Supported
Extended Temperature Refresh Rate Not Supported
On-Die Thermal Sensor Readout Not Supported
After clearing CMOS, the over-clock was reset to stock speed, and the DRAM speed at 1060, so I set that back to 1333, yet I still only get 15Gb usable.
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