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MD Athlon II X4 635 Propus 2 9GHz 4 x 512KB L2 Cache Socket AM3 95W fit in socke

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July 27, 2010 11:08:39 PM

Hello,I have a socket AM2 mobo I know the AM3's are not backwards compatible with am2 and am2+ due to the memory controller but are they making new flavors for the backwards compatibility? I have a Asus M2NPV-VM mobo, ddr 2 800 memory and are considering upgrades
July 27, 2010 11:15:34 PM

AM3 processors are compatible with AM2+ mainboards, as long as the manufacturers release a bios with support for them, however i don't know about AM2 mainboards.
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July 27, 2010 11:25:10 PM

According to this http://en.wikipedia.org/wiki/AM2%2B the am3 cpu needs the presence of the ddr3 memory to work. Also am3 cpu's have 941 pins. So its up to the mobo being compatible. I am considering getting a quad core vs a phenom need my pc more of a workhorse then a gaming machine. I would want to get a better cpu so it would be an easy fit when I get a new mobo down the road. Also when considering this cpu ddr3 has 240 pins could I just underclock the ram because I will be upgrading that 2.
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a c 203 à CPUs
a b } Memory
July 27, 2010 11:31:25 PM

I think you're reading that backwards.

"AM3 processors work on AM2+ motherboards due to the presence of both the DDR2 and DDR3 memory controller"

"AM2+ processors do not work on AM3 motherboards due to the processor's lack of a DDR3 memory controller"


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July 27, 2010 11:33:17 PM

Best answer selected by pballjay2383.
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July 27, 2010 11:36:40 PM

WR2 said:
Hello pballjay2383;

It looks like it's compatible with BIOS version 5005.
http://www.cpu-upgrade.com/mb-ASUS/M2NPV-VM.html



Thanks for that great link!!!! Thats hit the nail right on head!!! My next question would be the ram, my current mobo does ddr 2 800 mhz up to 8 gig thinking ahead when I buy a new mobo down the road I wanna just swap in the newer parts can I right now buy ddr3 memory and will that work with my current mobo?
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July 27, 2010 11:40:28 PM

I am looking up if the 5005 bios will have support for the ddr3 memory
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a c 203 à CPUs
a b } Memory
July 27, 2010 11:43:53 PM

You won't be able to use DDR3 in your motherboard.
The AM3 CPU has both a DDR2 & DDR3 memory controller on the CPU.
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July 27, 2010 11:49:02 PM

WR2 said:
I think you're reading that backwards.

"AM3 processors work on AM2+ motherboards due to the presence of both the DDR2 and DDR3 memory controller"

"AM2+ processors do not work on AM3 motherboards due to the processor's lack of a DDR3 memory controller"


I wasn't questioning the backwards compatibility of the AM3 CPU if you notice It does say you "need" the presence of the ddr3 controller for the AM3 cpu to work and as long as your am2+ does then your all set but I have a older am2 mobo with just a ddr2 controller so thats why I am concerned.
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July 27, 2010 11:51:01 PM

OIC the controller is on the chip not on the mobo I am thinking the mobo has to support it
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July 27, 2010 11:52:28 PM

WR2 said:
You won't be able to use DDR3 in your motherboard.
The AM3 CPU has both a DDR2 & DDR3 memory controller on the CPU.

I can't tone down the voltage to 1.8 and under clock the timings on the ddr 3 sticks ?? There both 240 pins
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a c 203 à CPUs
a b } Memory
July 27, 2010 11:54:51 PM

They have a key-notch in different places to prevent them being inserted in the wrong motherboards.

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July 27, 2010 11:57:59 PM

DD2 slower and is getting phased out and it more expensive than ddr3 so thats why I am considering ddr3, and also when I do get a newer mobo that will easily support it.
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Best solution

a c 203 à CPUs
a b } Memory
July 28, 2010 12:02:04 AM

You keep your DDR2 and Asus M2NPV-VM, flash the BIOS to 5005 and you can add the Athlon II X4 635 now.
You can move the Athlon II X4 635 over into a new AM3 motherboard with DDR3 when you get ready to continue your upgrading program.
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July 28, 2010 12:33:16 AM

WR2 said:
They have a key-notch in different places to prevent them being inserted in the wrong motherboards.

http://kadakam.files.wordpress.com/2008/12/ram%5Fkadakam.jpg

because of this awesome knowledge I have to reconsider my upgrade options my 1 gig of Ram is holding my system back and need to decide whether to keep this mobo instead of getting a newer cpu. I could get a newer board, newer chip, newer ram and try to get what I can for my old stuff and use the money for the more newer upgradeable faster stuff

Damn you are the best!!! Thank You for the awesome info!!! Wish I could help you in some way. Been coming to this site for close to 10 years and it never fails!!! Thanks Guys and Toms hardware!
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