Question Why my RAM speed stuck at 1066mhz FSB?

Jan 25, 2021
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My PC config:

  1. Intel(R) Core(TM)2 Duo CPU E8400 3.00GHz 6MB 1333 Bus
  2. 8GB DDR3 Dual Channel (2x4GB) 1333FSB RAM (This motherboard does not support single stick 8GB)
  3. GA-G41M-Combo (rev. 2.0) Overview | Motherboard
On Gigabyte BIOS overclocking setting I saw that ram installed speed showing 1333 FSB, but actually it's running on 1066FSB!
If I overclock up to 1334 FSB (exactly 1333 not allowed, 1331 & 1334 allowed) processor speed shows 3.78 something (I don't know exactly, I forgot)

Noted that, PC non-overclocked now.

You can see that those 3 components support 1333 Bus.


 

logainofhades

Titan
Moderator
Are you sure you are using DDR3 and not DDR2? Your board only supports 4gb of ddr3, according to the manual.

https://download1.gigabyte.com/Files/Manual/mb_manual_ga-g41m-combo_v2.0_e.pdf

DDR3: - 2 x 1.5V DDR3 DIMM sockets supporting up to 4 GB of system memory - Support for DDR3 1333(O.C.)/1066/800 MHz memory modules
DDR2: - 2 x 1.8V DDR2 DIMM sockets supporting up to 8 GB of system memory * Due to Windows 32-bit operating system limitation, when more than 4 GB of physical memory is installed, the actual memory size displayed will be less than 4 GB. - Support for DDR2 1066(O.C.)/800/667 MHz memory modules
 

logainofhades

Titan
Moderator
Not surprised, given the time of release. I frankly do not remember the settings of such old hardware anymore. See if there is a setting to set your ram and FSB to a 1:1 ratio. I vaguely remember that being a thing, back when I was using a Core 2 E8190, and Xeon X3210.
 
Jan 25, 2021
28
0
40
1
Are you sure you are using DDR3 and not DDR2? Your board only supports 4gb of ddr3, according to the manual.

https://download1.gigabyte.com/Files/Manual/mb_manual_ga-g41m-combo_v2.0_e.pdf
Obviously I'm using DDR3 & both are 1333 bus ram! But both are not from the same brand! one is Adata & another is Transcend.

Your board only supports 4gb of ddr3, according to the manual.
https://download1.gigabyte.com/Files/Manual/mb_manual_ga-g41m-combo_v2.0_e.pdf
logainofhades You forgot to check this one:

DDR3:
  1. 2 x 1.5V DDR3 DIMM sockets supporting up to 8 GB of system memory
 

logainofhades

Titan
Moderator
1333 is the bus speed, of your CPU, and is the stock FSB speed. Technically, yes, getting 1333, out of your ram is an overclock. Back then 1333 was higher than the JEDEC standard, for DDR3. You need to go over the bios options, in your manual.
 
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