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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.

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50 Comments - Last by WhoBeDaPlaya, 1381 days ago
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RE: I think there will be confusion by lsman, 1383 days ago
I too was expecting more when I saw the title. As AMD is selling more CPU-in-a-box than the OEM to the public. You are going to get a HSF anyway. So the added cost are to enthusiasts which will spend it anyway.

Reply
Whole new computer? by SnoMunke, 1383 days ago
quote:

those moving to AM2 will at a minimum need a new processor for a new Socket 940, new DDR2 memory to replace existing DDR memory for Athlon 64, and a new or revised heatsink/fan cooling solution.


Since the "new Socket 940" will basically mean a new motherboard, doesn't this pretty much sum up to "a whole new computer"?

Reply
RE: Whole new computer? by Olaf van der Spek, 1383 days ago
No. Existing F/H/ODD, PCI(-E) cards, case and PSU can be used.

Reply
label your pictures/figure by chennhui, 1383 days ago
Hi Wesley Fink,

Could you pls label your pictures/figure? It look a little bit confusing. Thanks.

Chen

Reply
RE: label your pictures/figure by Wesley Fink, 1383 days ago
Labels were added to the side-by-side comparisons.

Reply
Little Sense by Ropey, 1383 days ago
So in order to utilize ddr2 there is an entirely new formfactor? AMD is a bit too quick to change sockets imo.

This just makes no sense to me.

R

Reply
RE: Little Sense by avbauwel, 1383 days ago
So you'd rather have the same socket with completely different singnal traces?

That'd enable you to A: possibly blow up your CPU if you insert the wrong CPU in the socket (memory voltage is different for DDR/DDR2, traces are different) B: buy a new motherboard and then notice you cannot use your current CPU and memory.. But still it has the same socket.

i rather have a new socket when memory changes, then keeping the same socket.. Makes it alot easier to find the correct motherboard for the new CPU's, especially for the non-enthousiasts out there buying PC's..

Btw: if you think AMD is changing quickly (s939 is NOT dead yet btw ;)), take a look at inbtels track record for needed mainboard changes with CPU versions changing, and then i'm not even talking about a memory controller change...

Reply
RE: Little Sense by xsilver, 1383 days ago
i think what one dude was reffering to above was it would be great if amd made a socket that was obviously different -- having 2 socket 940's that are not compatible may lead users to jam an old socket 940 cpu into a am2 mobo and bend the pins

Reply
RE: Little Sense by eastvillager, 1383 days ago
...which is a pretty good sign they shouldn't be working inside a pc.

If people don't understand the ZIF concept, they need to leave CPU installation to somebody who does.

Reply
RE: Little Sense by tygrus, 1383 days ago
If the northbridge had a DDR memory contoller built in, then the CPU could reuse the old stuff as additional RAM (slower + more latency) or the OS use it as a RAMdrive.

Reply
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