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Guru3D.com » Review » Phenom II X4 965 BE revision C3 review » Page 3

Phenom II X4 965 BE revision C3 review - Socket Compatibility

by Hilbert Hagedoorn on: 11/03/2009 03:00 PM [ 5] 0 comment(s)

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Phenom II Socket Compatibility explained: AM2+ and AM3

With each and every Phenom II review we'll keep explaining this. AMD has an approach we here at Guru3D appreciate very much. That is to try to stick as long as they can with a processor socket design. Therefore the good news is, even if you have an AMD 785/790 AM2+ compatible motherboard, you can pop in the new AM3 processors and it'll work.

Two cardinal rules you need to keep in mind:

  • You can use a socket AM3 processor on a Socket AM2+ motherboard
  • You cannot use a Socket AM2 processor on a Socket AM3 motherboard

If you do plan to plant an AM3 processor into an AM2+ socket please upgrade your BIOS (motherboard BIOS) prior to to the new processor for the latest Phenom II compatibility straight out of the box.

Motherboards wise any AMD 790 FX or GX chipset purchased last year should be compatible with Socket AM3 processors. Some of you might even have luck with slightly older AMD 780 chipset based motherboards. But for 780 motherboards there is a second restriction, please do make sure your motherboard can handle the power requirements of the processor. Please check this with your motherboard manufacturer.

What is the difference between Socket AM2 and AM3 then?

Socket AM3 package based motherboards and processors have been introduced with one thing in mind, to get DDR3 memory support. That's it.

Today's processors reviewed are in fact Socket AM3 processors. So (and again, to make it clear) it will fit on Socket AM2+ motherboards which do support Phenom II. The only snag is that you are forced to use DDR2 memory. But that is not a bad thing as the performance hit really is marginal.

What's the physical difference in-between the two sockets? Two extra pins (940 for AM2+ vs 938 for AM3) makes the older chips mechanically incompatible with the new socket, preventing users from attempting to install an old chip in a new board.

So if you want to go for DDR3, a migration towards an Socket AM3 motherboard is mandatory. Once you do have a Socket AM3 motherboard, you'll get support for up-to DDR-1333 MHz memory.

On socket AM2+ you'll be able to make use of DDR2-1066 MHz memory, while on socket AM2 you'll be limited to 800 MHz.

Right, that's crystal clear now eh?

AMD Phenom II X4 965 Black Edition

 

No Sir, we're not smoking the Dragon. But a name you have heard in our reviews before is 'Dragon'. When AMD launched the initial Phenom processors, they did so under the codename 'Spider'. Spider entailed the AMD 780 chipset, Radeon series 3000/4000 and obviously the B3 generation Phenom processors.

Just to explain: The Dragon platform is the infrastructure that is the AMD 785/790GX/FX chipset, a Radeon 4000/5000 series graphics card and thus the Phenom II series processors. Below you can see such a motherboard, the MSI 785GM-E65.

MSI 785GM-G65




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