Whats the story on future A64 memory???

[Twsmit]

Im thinking about a socket 939, PCIe, DDR1 system. From what i know AMD isnt planning on moving to DDRII until well after intel. (because of the onboard memory controller) I also read some where, maybe a rumor, but AMD is going to move to a faster FSB/hypertransport sometime this year or next.

My questions:

Will the socket 939 A64's run DDR1 during 2005?

What speed DDR1? PC3200? or something faster?

What FSB will the next gen A64's run at?

 

[Peter D]

I thought I read that 939's will be running at 1GHz HTT (2GHz), but not sure. I think AMD is gunna stay with DDR1 for a while and see how it works out. From the looks of it, DDR2 is gunna be extremely expensive, and it wont be mainstream till at least '05. 2004 and '05 look like they will be full of new things to upgrade to like 939, P5, DDR2, PCI Express, BTX, R420/423, etc etc so it might be worth your while (and money) to wait a little and see how things pan out, IMO

 

[Twsmit]

ya i read that also. So a 1ghz hypertransport will still use PC3200?

I plan on waiting everything out until december 04, january 05 .... but if i get the chance id like to get a few parts for my current system. I ended up ditching my PC3200 and right now im running PC2700. I might consider picking up a cheap NF2 and some DDR1 that will work with a A64.

 

[Peter D]

Originally posted by: Twsmit
ya i read that also. So a 1ghz hypertransport will still use PC3200?

Not sure. I dont really understand how the HTT works in correlation with RAM FSB. The chip runs at 200MHz HTT, but its bus is 1.6GHz?

 

[Markfw]

Originally posted by: Vegetto

Originally posted by: Twsmit
ya i read that also. So a 1ghz hypertransport will still use PC3200?

Not sure. I dont really understand how the HTT works in correlation with RAM FSB. The chip runs at 200MHz HTT, but its bus is 1.6GHz?

The HTT is actiually 800, 1600 for the FX-51 and the Opteron. The 200x4 is how the HTT bus gets its bandwidth. I would GUESS that the 1000 (2000 for Opteron ??) would be either 250x4 or 200x5.

 

[Peter D]

Originally posted by: Markfw900

Originally posted by: Vegetto

Originally posted by: Twsmit
ya i read that also. So a 1ghz hypertransport will still use PC3200?

Not sure. I dont really understand how the HTT works in correlation with RAM FSB. The chip runs at 200MHz HTT, but its bus is 1.6GHz?

The HTT is actiually 800, 1600 for the FX-51 and the Opteron. The 200x4 is how the HTT bus gets its bandwidth. I would GUESS that the 1000 (2000 for Opteron ??) would be either 250x4 or 200x5.

Ah, thank you

 

[MDE]

Originally posted by: Markfw900

Originally posted by: Vegetto

Originally posted by: Twsmit
ya i read that also. So a 1ghz hypertransport will still use PC3200?

Not sure. I dont really understand how the HTT works in correlation with RAM FSB. The chip runs at 200MHz HTT, but its bus is 1.6GHz?

The HTT is actiually 800, 1600 for the FX-51 and the Opteron. The 200x4 is how the HTT bus gets its bandwidth. I would GUESS that the 1000 (2000 for Opteron ??) would be either 250x4 or 200x5.

I think it's 200x4=800MHzx2=1600MHz (dual one-way links)

 

[InlineFive]

Originally posted by: MonkeyDriveExpress

Originally posted by: Markfw900

Originally posted by: Vegetto

Originally posted by: Twsmit
ya i read that also. So a 1ghz hypertransport will still use PC3200?

Not sure. I dont really understand how the HTT works in correlation with RAM FSB. The chip runs at 200MHz HTT, but its bus is 1.6GHz?

The HTT is actiually 800, 1600 for the FX-51 and the Opteron. The 200x4 is how the HTT bus gets its bandwidth. I would GUESS that the 1000 (2000 for Opteron ??) would be either 250x4 or 200x5.

I think it's 200x4=800MHzx2=1600MHz (dual one-way links)

I thought it was too.

 

[Markfw]

Originally posted by: PorBleemo

Originally posted by: MonkeyDriveExpress

Originally posted by: Markfw900

Originally posted by: Vegetto

Originally posted by: Twsmit
ya i read that also. So a 1ghz hypertransport will still use PC3200?

Not sure. I dont really understand how the HTT works in correlation with RAM FSB. The chip runs at 200MHz HTT, but its bus is 1.6GHz?

The HTT is actiually 800, 1600 for the FX-51 and the Opteron. The 200x4 is how the HTT bus gets its bandwidth. I would GUESS that the 1000 (2000 for Opteron ??) would be either 250x4 or 200x5.

I think it's 200x4=800MHzx2=1600MHz (dual one-way links)

I thought it was too.

The Athlon64 does NOT have dual memory controllers, only the FX-51 and Opterons, So I don't know how it could have dual links.

 

[MDE]

This is HyperTransport, not memory.

 

[MadRat]

I think its one external dual-channel (128-bit @max. 6.4GB/sec) link from the memory controller on an FX-51 and Opteron, and one external single-channel (64-bit @max. 3.2GB/sec) link from the memory controller on an A64. Most people confuse HT with the memory controller links, but they are mutually exclusive. The HT is for the connection to the southbridge and connections to other CPU's.

Its three 1600MHz (3x 16-bit = max. 19.2GB/sec) HT links for 8xx-series Opteron, two 1600MHz (2x 16-bit = max. 12.8GB/sec) HT links for the 2xx-Opteron, and only one 1600MHz (1x 16-bit = max. 6.4GB/sec) HT link for the A64, 1xx Opteron, and FX-series. The multiple HT links on high-end Opterons are so that they are glueless between processors in the system; all the way up to either two, four, or eight processors depending on the Opteron type. The A64, 1xx Opterons, and FX-series are not meant for SMP. It doesn't mean they cannot be used in SMP if a bridge was designed for it, but the expense of the bridge would make it utterly futile to bring one to market.

 

[Markfw]

Originally posted by: MadRat
I think its one external dual-channel (128-bit @max. 6.4GB/sec) link from the memory controller on an FX-51 and Opteron, and one external single-channel (64-bit @max. 3.2GB/sec) link from the memory controller on an A64. Most people confuse HT with the memory controller links, but they are mutually exclusive. The HT is for the connection to the southbridge and connections to other CPU's.

Its three 1600MHz (3x 16-bit = max. 19.2GB/sec) HT links for 8xx-series Opteron, two 1600MHz (2x 16-bit = max. 12.8GB/sec) HT links for the 2xx-Opteron, and only one 1600MHz (1x 16-bit = max. 6.4GB/sec) HT link for the A64, 1xx Opteron, and FX-series. The multiple HT links on high-end Opterons are so that they are glueless between processors in the system; all the way up to either two, four, or eight processors depending on the Opteron type. The A64, 1xx Opterons, and FX-series are not meant for SMP. It doesn't mean they cannot be used in SMP if a bridge was designed for it, but the expense of the bridge would make it utterly futile to bring one to market.

Thanks you MadRat, I thought I was close, but this is a much better explanation. I stand corrected.

 

[MadRat]

Correct me if I'm wrong, but AMD arrives at the 1600MHz HT figure because its 2-ways (full-duplex) at 800Mhz each way, giving it only a potential for 3.2GHz each way. Right?

 

[Twsmit]

ok so the concensus is that the HHT speed has no relation to the memory. What do people think of investing in some PC3500 or PC3200 for next years socket 939's? Or is that too far off?

 

[klah]

Originally posted by: Twsmit
What do people think of investing in some PC3500 or PC3200 for next years socket 939's? Or is that too far off?

Should be 1-2 months, not next year.


AnandTech: AMD 2004 CPU Roadmap Update

 

[Twsmit]

well i heard the next few months they are doing a VERY limited run 10,000 chips or so. Also im interested in the 4000 - 4200+ not the current chips.

 

[alexruiz]

The HT speed has nothing to do with the memory.....

Regarding the topic, I suspect the new memory controllers will be operating at DDR500