Installed 8 GB RAM, only 4 GB usable, what's wrong?

Zammoron · Jul 28, 2015

Hi!

I recently decided to upgrade my old computer with some new RAM and bought a cheap 2x4 GB RAM set but now that I've installed them, Windows says "8 GB, 4 GB usable".

I have read on the forums as much as I can and understand, I have tried updating BIOS and such but it didn't do anything. It warns in the add about being "high density" memory, but when I looked that up I thought it would either work or not work at all, not as it is right now.

Please help!

Speccs:
Windows 7 x64
Motherboard: Gigabyte P35-DS4
CPU: Intel Core Duo E6750, socket 775 LGA @ 2.66GHz

CPU-Z says this about the memory:
Memory SPD
-------------------------------------------------------------------------

DIMM # 1
SMBus address 0x50
Memory type DDR2
Module format Regular UDIMM
Manufacturer (ID) Samsung (CE000000000000000000)
Size 4096 MBytes
Max bandwidth PC2-6400 (400 MHz)
Part number Zhidian4GDDR800
Serial number AC45EC38
Manufacturing date Week 50/Year 14
Number of banks 2
Data width 64 bits
Correction None
Nominal Voltage 1.80 Volts
EPP no
XMP no
AMP no
JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency
JEDEC #1 5.0-6-6-18-24 @ 400 MHz

DIMM # 2
SMBus address 0x52
Memory type DDR2
Module format Regular UDIMM
Manufacturer (ID) Samsung (CE000000000000000000)
Size 4096 MBytes
Max bandwidth PC2-6400 (400 MHz)
Part number Zhidian4GDDR800
Serial number AC45EC38
Manufacturing date Week 50/Year 14
Number of banks 2
Data width 64 bits
Correction None
Nominal Voltage 1.80 Volts
EPP no
XMP no
AMP no
JEDEC timings table CL-tRCD-tRP-tRAS-tRC @ frequency
JEDEC #1 5.0-6-6-18-24 @ 400 MHz

RageGamingZone · Jul 28, 2015

hey maybe you can verify this option in MSCONFIG and make sure maximum ram is unchecked same as the screenshot http://i1013.photobucket.com/albums/af254/Jaquith/Boot_OPT.gif

Samat · Jul 28, 2015

Your motherboard doesn't propably properly support the memory. Check the motherboard revision (should read somewhere on the motherboard) and check this Gigabyte support site for supported memory (http://www.gigabyte.com/products/product-page.aspx?pid=2638#ov). That motherboard supports a maximum of 8GB memory, and it most likely can only achieve it through using 4x2GB modules.

yeticorn · Jul 28, 2015

You sure that's an x64 install? Sounds like x86

Samat · Jul 28, 2015

You can check if your windows install is 64 bit by going to control panel > system.

Tradesman1 · Jul 28, 2015

Max config is for 4x2GB, 4GB sticks it can't fully use

Zammoron · Jul 29, 2015

Thank you all, even though the news were bad (that it's probably only a 4x2 GB set that is supported)!

Zammoron · Jul 29, 2015

RageGamingZone :

Thanks!

I checked and there was no maximum RAM limit. It's probably like some of the others have said, only 4x2 GB set that is acceptable for the motherboard. Lucky it was cheap RAM

Zammoron · Jul 29, 2015

Samat :

Thank you!

This is probably it, sadly...

Zammoron · Jul 29, 2015

Tradesman1 :

Damnit... You are probably right.

Thanks for the help!

Zammoron · Jul 29, 2015

yeticorn :

I'm sure it's Windows x64. It's probably what the other dudes said, the motherboard is not able to handle 2x4 GB set, it needs 4x2 instead...

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