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AMD AM2: More than just a Memory Change
AMD AM2: More than just a Memory Change
Date: February 6th, 2006
Topic: CPU & Chipset
Manufacturer: AMD
Author: Wesley Fink
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AMD AM2: More than just a Memory Change

The new AMD technology refresh, now called AM2, will bring DDR2 memory to the Athlon64 on-processor memory controller. Many in the industry have speculated about the impact of this low latency memory controller on DDR2 performance, which to this point has suffered under the impact of the higher latency Intel Netburst architecture. We are looking forward to the opportunity to take a closer look at DDR2 performance on AM2 - which is everyone's big question.

There will be more than just new memory with AM2, however. We now have details on the new Socket 940 for AM2. It has been widely reported that the new Socket 940 will not be compatible with the existing Socket 940 used for Opteron and early Athlon 64.

Photos of the back of the new AM2 processor show how very close the new design is to the current Socket 940.

AM2 Processor


Current Socket 940 (Reversed)

By flipping the current 940 socket photo and comparing pin-outs to the back of the AM2, you can clearly see the top 2 "lands", areas without pins, are identical in the current Socket 940 and the AM2 Socket 940. However, the bottom two lands are in different locations. The bottom right land is the same 2 pins up, but 7pins form the edge instead of the 5 in the current 940 design. The left land is also in the same row position as the current 940, but it is 6 pins from the left edge instead of 8 as in the current 940 design.

The AM2 940 and current Opteron 940 are so close in design; you have to conclude that AMD could have used the same socket design. But there are numerous electrical differences and different memory is required. AMD apparently used a revised Socket 940 to prevent any possibility that AM2 chips might get accidentally mounted in current Socket 940 motherboards. That is probably a very wise decision.

New AM2 Cage   Next Page

 
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50 Comments - Last by WhoBeDaPlaya, 1062 days ago
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Pretty sweet by Powermoloch, 1065 days ago
Not bad, not bad at all. Especially keeping the HSF mount same as usual w/ the other Athlon 64 counterparts. This saves a few bucks or more for some people that's for sure ;).

RE: Pretty sweet by Wesley Fink, 1065 days ago
The point of the article is that your current Athlon64 Heatsink/Fans will likely NOT work on the new AM2 cage. We didn't have a single HSF in house that would fit the new AM2 mounting cage.

RE: Pretty sweet by BrownTown, 1065 days ago
lol, do people even read these articles or jsut try to get the first comment?

RE: Pretty sweet by Lifted, 1065 days ago
I think the answer is rather obvious in this case.

My bad by Powermoloch, 1065 days ago
Oops. I kinda speed reading there, lol my bad :)

RE: My bad by jkostans, 1064 days ago
No..... you're just and IDIOT!

RE: My bad by Bonesdad, 1064 days ago
he can't read, you can't write...let's call the whole thing off...

;-)

RE: Pretty sweet by Live, 1065 days ago
Very bad news this! I was definitely planning to move my current cooling over to the new socket. This adds even more cost to upgrading :(

RE: Pretty sweet by Live, 1064 days ago
Very good info tough. So thanks a bunch for the article. I used to think that the only things that would not move over was the CPU, memory and motherboard. Now I guess we will have to add cooling to that list.



I think there will be confusion by huges84, 1065 days ago
Is it just me, or are socket 940 and socket AM2 too similar? I don't think that the differences are obvious enough. It would be pretty easy to mistake one for the other. Also, I don't understand the change in heatsink mounts, unless the cooling rewuirements have changed enough that previous coolers are inadequate. Maybe they are trying to encourage OEMs to buy their heatsinks from AMD instead of making their own? I hope the new heatsinks will at least still use the locking lever design. That was pretty simple and worked well.

I was hoping for a lot more information when I saw the article. I thought maybe AMD was ahead of schedule and so we were going to get some details early. But the article says they're a little behind. Oh well. At least the delay 'til summer will coincide with me getting the money to upgrade. Of course I need to see a few reviews first.

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