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BIOS and memory clocking

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Byste   07-04-2009 at 05:00:53 AM

Like JoseWaldo in a previous thread, I too have the M4A78 Plus MoBo and got the G.Skill 2x2GB 1066 DDR2 sticks, as well as the AMD Phenom II X2 550 processor. I'm trying to figure out how to run the two sticks at 1066 MHz... In the BIOS, you can only set the clock at 200, 266, 400, and 533 MHz-- no higher. How do you get up to 1066 when the MoBo doesn't even seem to support it?... Or am I just an idiot? Is there another way to set the memory clock or are you supposed to do it in the jumper-free configuration menu of the BIOS? I suppose I could leave it on Auto and just hope the system just goes along with 1066, but I've read in the reviews on this particular memory stick computers usually set it to 800 and you do have to manually step it up. I suppose 800 would be better than 533, but still-- what the hell? Help meeee.

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MikeJRamsey   07-04-2009 at 06:56:32 AM
- -1 +

Byste,
Three things to know about your MOBO.

  • You can only use a single 1066 MHz Dim per channel.
  • For system stability, when four DIMMs are inserted, the timing is set to 800 MHz
  • The default DIMM frequency depends on the inserted DIMM's Serial Presence Detect (SPD) setting which is read by the BIOS; you can override this in the BIOS; I wouldn't.


If you insert the 1st 1066 MHz DIMM in slot DIMM_A1 and the other in slot DIMM_B1, and you leave the other two slots empty, and you don't force a timing in the BIOS that is less then if it is going to run at 1066 MHz it will.

http://en.wikipedia.org/wiki/Serial_Presence_Detect

Mike

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MaDMagik   07-04-2009 at 12:02:06 PM
- 0 +

DDR = Double Data Rate

533mhz = DDR2 1066

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stoner133   07-04-2009 at 07:57:12 PM
- 0 +

Byste wrote :

Like JoseWaldo in a previous thread, I too have the M4A78 Plus MoBo and got the G.Skill 2x2GB 1066 DDR2 sticks, as well as the AMD Phenom II X2 550 processor. I'm trying to figure out how to run the two sticks at 1066 MHz... In the BIOS, you can only set the clock at 200, 266, 400, and 533 MHz-- no higher. How do you get up to 1066 when the MoBo doesn't even seem to support it?... Or am I just an idiot? Is there another way to set the memory clock or are you supposed to do it in the jumper-free configuration menu of the BIOS? I suppose I could leave it on Auto and just hope the system just goes along with 1066, but I've read in the reviews on this particular memory stick computers usually set it to 800 and you do have to manually step it up. I suppose 800 would be better than 533, but still-- what the hell? Help meeee.



Did you update the motherboard BIOS to support the X2 550 processor?

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Byste   07-07-2009 at 12:28:42 AM
- 0 +

stoner133 wrote :

Did you update the motherboard BIOS to support the X2 550 processor?




Didn't need an update, actually.

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Byste   07-07-2009 at 12:29:23 AM
- 0 +

MaDMagik wrote :

DDR = Double Data Rate

533mhz = DDR2 1066




Aaah, this is the answer I'm looking for. Thanks much for the translating.

Reply to Byste
Byste   07-07-2009 at 12:33:50 AM
- 0 +

MikeJRamsey wrote :

Byste,
Three things to know about your MOBO.

  • You can only use a single 1066 MHz Dim per channel.
  • For system stability, when four DIMMs are inserted, the timing is set to 800 MHz
  • The default DIMM frequency depends on the inserted DIMM's Serial Presence Detect (SPD) setting which is read by the BIOS; you can override this in the BIOS; I wouldn't.


If you insert the 1st 1066 MHz DIMM in slot DIMM_A1 and the other in slot DIMM_B1, and you leave the other two slots empty, and you don't force a timing in the BIOS that is less then if it is going to run at 1066 MHz it will.

http://en.wikipedia.org/wiki/Serial_Presence_Detect

Mike



Thanks Mike, but I actually knew these things. I only had two sticks anyway, so it doesn't even apply. Thanks for pitching in, though.

Reply to Byste
MaDMagik   07-07-2009 at 08:52:38 PM
- 0 +

Heheh, no probs

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