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Memory Size Reporting

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Anonymous
a b } Memory
a b V Motherboard
November 7, 2010 2:34:03 PM

Hello,

I'm running and Asus M4A785TD-V EVO with 4GB memory in 2 sticks (Corsair TW3X4G1333C9A). I'm currently trying to test my memory to sort out a crashing problem I've been having.

In the middle of trying different slotting configurations the intermittant faults I was trying to trace seem to have stopped, _but_ MemTest86+ and Windows Resource Monitor are reporting 256M less memory than expected (each stick individually is showing 1792M and both together 3840M). On balance this doesn't look good to me, but I wanted to get another opinion. Is there a possible explanation for this?

More about : memory size reporting

a c 207 Ĉ ASUS
a c 347 } Memory
a c 717 V Motherboard
November 7, 2010 3:00:18 PM

Welcome to Tom's Forums! :) 

Corsair Tested - http://www.corsair.com/configurator/product_results.asp... -> OK {TW3X4G1333C9A} is indeed listed.

REF M4A785TD-V EVO http://usa.asus.com/product.aspx?P_ID=fcsXWSxnhzZE9rnR

Q - What CPU?
Q - What DIMM Slots are you using?
Q - What BIOS version?
Q - What BIOS settings are you using for the Memory settings?
Q - What OS AND type {32/64-bit}

I need all (5) questions answered.

Also, post the following {windows 7}:
Anonymous
a b } Memory
a b V Motherboard
November 7, 2010 5:29:19 PM

Hi jaquith, thanks for the help:

Q - What CPU?
Phenom II X2 550

Q - What DIMM Slots are you using?
A1 and B1

Q - What BIOS version?
2105

Q - What BIOS settings are you using for the Memory settings?
Memory Timing and Voltage are set to Auto
Bank Interleaving - Auto
Channel Interleaving - XOR or Address bit
Enable Clock to All DIMMS - Disabled
MemClk Tristate C3/ATLVID - Disabled
Memory Hole Remapping - Enabled
DCT Unganged Mode - Always
Power Down Enable - Disabled

Q - What OS AND type {32/64-bit}
Windows 7 Home Premium 64-bit

http://img831.imageshack.us/img831/5792/capturenu.jpg
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a c 207 Ĉ ASUS
a c 347 } Memory
a c 717 V Motherboard
November 7, 2010 6:37:11 PM

The reason I asked for the BIOS version + CPU; Verify correct BIOS per CPU and pertinent BIOS fixes = good

Obviously DIMM slots to verify CPU: | A2 | B2 | A1 | B1 | ; Verify correct slots Dual Channel = good

Windows OS as stated above = good.

The Integrated ATI Radeon HD 4200 GPU seems to be using 256MB or 0.25GB RAM {H/W reserved = 258 MB total} The memory can be adjusted up to 512MB or 0.5GB, and the can be OC to 1000 MHz {default = 500 MHz}. However, I did not see in the manual a way to disable it IF you have a dedicated GPU; in general it 'might' be listed in the 'Onboard Devices Configuration' ; otherwise the onboard GPU can be disabled via the Device Manager.

BIOS:
Memory Timing and Voltage are set to Auto ; good
Bank Interleaving - Auto ; good
Channel Interleaving - XOR or Address bit
Enable Clock to All DIMMS - Disabled ; good
MemClk Tristate C3/ATLVID - Disabled ; good
Memory Hole Remapping - Enabled ; good

DCT Unganged Mode - Always ; -----> if there's an instability then change

Power Down Enable - Disabled ; good

I look at everything that you posted, and clearly the ANS is your Integrated ATI Radeon HD 4200 which 'shares' your DDR3 RAM.

Do you have a dedicated GPU?
Anonymous
a b } Memory
a b V Motherboard
November 8, 2010 7:52:30 AM

jaquith said:
I look at everything that you posted, and clearly the ANS is your Integrated ATI Radeon HD 4200 which 'shares' your DDR3 RAM.

Do you have a dedicated GPU?

Oops. Yes I do have a seperate GPU which I unplugged while I was testing. Of course your right about the onboard video, I really should have seen that one myself. Reconnected the graphics card and I'm back to normal. :whistle: 

Thank you for your time and your help. :) 

jaquith said:
DCT Unganged Mode - Always ; -----> if there's an instability then change

Thank you for this particularly. I'll look into it.
a b } Memory
a b V Motherboard
November 8, 2010 6:31:16 PM

Quote:
Hello,

I'm running and Asus M4A785TD-V EVO with 4GB memory in 2 sticks (Corsair TW3X4G1333C9A). I'm currently trying to test my memory to sort out a crashing problem I've been having.

In the middle of trying different slotting configurations the intermittant faults I was trying to trace seem to have stopped, _but_ MemTest86+ and Windows Resource Monitor are reporting 256M less memory than expected (each stick individually is showing 1792M and both together 3840M). On balance this doesn't look good to me, but I wanted to get another opinion. Is there a possible explanation for this?


I have that same board with 4GB of ram, but it reports 3830MB as some of it is hardware reserved (onboard VGA etc). As Angharan1971 linked
!