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Quad-core, HyperTransport 3.0 and more

AMD is expected to release its 65nm products soon. Moving beyond the 65nm Brisbane die shrink and Windsor FX, AMD has a couple of other tricks up its sleeves. AMD plans to transition from its Cities core products to new Stars cores. This transition uses AMD’s new core naming scheme. While AMD has typically named its processor cores after cities, the new naming scheme uses star names.

The Stars family includes the upcoming Agena FX, Agena, Kuma, Rana and Spica cores. AMD will be introducing plenty of architectural changes with the upcoming Stars family. Stars family processors will switch over to AMD’s previously announced HyperTransport 3.0 architecture. Previously, Star processors have been referred to as Revision H or K8L -- if that's not confusing enough, AMD calls the architecture of the Stars family Greyhound. While Stars family processors use the HyperTransport 3.0 protocol, it will be backwards compatible with HyperTransport 1.0 systems.

HyperTransport 3.0 is expected to provide twice the amount of bandwidth between the processor and chipset. It will also allow the processor and internal north bridge to operate at different frequencies as well. With HyperTransport 3.0, the north bridge can operate at 75% of the maximum clock frequency of the processor. AMD roadmaps claim the greater bandwidth of HyperTransport 3.0 is important for PCIe 2.0 and upcoming multi-GPU, integrated graphics and multiprocessor performance.

In addition to HyperTransport 3.0, Stars family processors feature a 128-bit floating point unit for each CPU core, DDR2-1066 support, SSE4A instructions and a split power plane. Split power planes allow the processor and internal north bridge to operate at different voltages and speeds. The advantages of split power planes are it allows the north bridge speed and voltage to never change during Cool’n’Quiet power saving measures. With split power planes the Stars processors require separate PLLs for the processor and internal north bridge.

Stars family processors will use socket AM2+, with the exception of the Agena FX. Nevertheless, Stars family processors will be backwards compatible on socket AM2 motherboards, though performance is sacrificed by falling back to HyperTransport 1.0. AMD's documentation no longer refers to AM3; it appears AM2+ is the expected socket AM3.

Beginning in Q3’2007 AMD is expected to release its first Stars quad-core processors. The new quad-core processors are based on AMD’s Agena and Agena FX cores. Targeting AMD’s 4x4 platform is the Agena FX core. Agena FX will only be available on Socket 1207+ and offer dual processor functionality. The vanilla Agena core will be available on single processor socket AM2+ platforms.

Agena FX and Agena based processors offer identical features. New to the Agena FX and Agena cores is a shared L3 cache. 2MB of L3 cache will be shared between all four processor cores. The L2 cache will be 2MB as well. Clock frequencies of 2.7 GHz to 2.9 GHz are initially expected. The HyperTransport 3.0 frequency for Agena FX and Agena cores is expected to be clocked at 4000 MHz. Agena FX and Agena core processors will be manufacturing using a 65nm process and carry 125W TDPs. The first Agena FX and Agena based processors are expected to arrive in Q3’2007.

AMD will be releasing new Kuma core dual-core processors in Q3’07 as well. The new Kuma core processors feature HyperTransport 3.0 clocked at 4000 MHz, 1MB of L2 cache and 2MB of shared L3 cache. Kuma processors are expected to arrive in 2.0 GHz to 2.9 GHz frequencies for socket AM2+. TDP for Kuma core processors is expected at 89W and 65W.

Single-core products won’t be left out of the Stars family either. AMD will release single-core Rana and Spica cores towards the end of 2007. Rana core processors will be replacing Orleans and Lima Athlon 64 single-core processors while Spica will be replacing single-core Venice Athlon 64 and Manilla Sempron processors. AMD’s roadmap doesn’t reveal too much on Rana and Spica. Nevertheless, Rana and Spica will feature HyperTransport 3.0 and socket AM2+ compatibility.



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Bit Slower than I would of liked
By Zurtex on 11/14/2006 6:56:32 PM , Rating: 1
Was hoping that they'd have ramped up development process and have AM3 and K8L out by the end of 2007 :(

Unless Stars provides significant performance increase, they're not going to be able to get themselves out of anything other than providing budget CPUs.




RE: Bit Slower than I would of liked
By Korvon on 11/14/2006 6:59:59 PM , Rating: 1
"The new Kuma core processors feature HyperTransport 3.0 clocked at 4000 MHz"

A 4GHZ quad core... seems like a improvement to me.


RE: Bit Slower than I would of liked
By Goty on 11/14/2006 7:01:46 PM , Rating: 2
4000MHz is the speed of the HT bus, not the clockspeed of the processor.


RE: Bit Slower than I would of liked
By kamel5547 on 11/14/2006 7:04:23 PM , Rating: 2
Its not a 4 Ghz quad core, its a 4 ghz hypertransport bus (currently @ 2 Ghz). Who knows how much of a boost this will actually bring.


RE: Bit Slower than I would of liked
By Goty on 11/14/2006 7:15:08 PM , Rating: 2
Well, since the A64 STILL isn't bandwidth limited in any case, I'm not thinking all that much.


RE: Bit Slower than I would of liked
By TiberiusKane on 11/14/2006 7:31:24 PM , Rating: 2
I'm not sure whether the FPU is going to be put on the same chip and I don't know how it works, but is there a chance that they're ramping up the bandwidth to prepare for putting in a GPU as well? Because then, there would be bandwidth demand. What effect does the HyperTransport have on a hypothetical on-die GPU?


RE: Bit Slower than I would of liked
By saratoga on 11/14/2006 8:21:22 PM , Rating: 2
The FPU was brought on die in the 386 era, so yes, these cores will have on die FPUs. Its really not possible to build a modern x86 core without one because of how the ISA works.

Putting the GPU on die would make the HT bandwidth a lot less important, since on single processor systems the GPU uses virtually all of the HT bandwidth. Putting it on die would remove that traffic, leaving only sound cards, NICs, hard disks, etc.

The faster HT clock is aimed at mulitsocket systems. The current HT setup was barely adequate for 8 socket systems, and could use improvement at 4 sockets too.


RE: Bit Slower than I would of liked
By aGreenAgent on 11/14/2006 9:35:44 PM , Rating: 2
Well, you're assuming that the on-die GPU is all the GPU power of the system. Having a graphics card and a GPU on the CPU (which is the idea, I think) would still require the same bandwidth as it does without the on-die GPU (give or take).


By saratoga on 11/14/2006 9:45:34 PM , Rating: 2
quote:
Having a graphics card and a GPU on the CPU (which is the idea, I think) would still require the same bandwidth as it does without the on-die GPU (give or tak


Yes, obviously if you do not use an on die GPU, then this doesn't apply to you. I'm not really sure what you're getting at though.



By saratoga on 11/14/2006 9:49:32 PM , Rating: 2
Ah, you mean using both at once. Still I don't really see how thats relevent to what I wrote. Either you save HT bandwidth by using the onboard and skipping PCI-E, or you don't. Either way, it doesn't really make a difference from today.


RE: Bit Slower than I would of liked
By Calin on 11/15/2006 3:24:28 AM , Rating: 2
On gaming machines, the HT link might be used almost only for the GPU traffic - but once you start gaming, the GPU will access its memory (video card memory) at some extraordinary rate (gigabytes/second). If you put the GPU on CPU, you will need to give it fast memory access (as of now, a GPU could use a 128-bit lane to 500MHz DDR memory. Future GPU - see 8800 - uses thrice the width)
No, video cards are here to stay for the performance sector


RE: Bit Slower than I would of liked
By Viditor on 11/14/2006 7:35:49 PM , Rating: 3
quote:
Was hoping that they'd have ramped up development process and have AM3 and K8L out by the end of 2007


Ummm..."Stars" processers ARE K8L. As to AM3, that wouldn't really make sense as DDR3 isn't even available yet, and will be extremely expensive in 2007 even if it does show up.
The change in "Stars" is rather major according to all of the documentation...it should (on paper) equal or surpass Core 2 architecture when combined with HT and the ODMC.

What I don't get is the reference to release in Q3 by the author...AMD has been stating that they will begin release of the new cores late in Q2. If there's been a change, it would be nice to see a post of the link for it.


RE: Bit Slower than I would of liked
By Aikouka on 11/15/2006 8:45:31 AM , Rating: 2
Problem is... if I remember Intel's roadmap correctly, their new 65nm refresh comes out Q2 2007. I'm not sure if it's a refresh or a change, though... been awhile since I've seen the chart!


RE: Bit Slower than I would of liked
By othercents on 11/15/2006 11:06:03 AM , Rating: 2
If Intel's 65nm refresh is in Q207 then they fit right in line with AMDs 65nm products coming out in 1Q07 and then there star product line coming out in 3Q07. I just can't believe that AMD is actually going to allow a full year to go buy before they produce something significant to compete against Intel C2D.

I do believe that AMD has more up its sleeve than it is letting on. For example if you can get HT3.0 to work all the way to the GPU on an ATI graphics card then you will definitely see a performance boost over the competitors. Only time will tell and I believe that AMD is now cutting it close and with this roadmap. You might see many more AMD faithful buying their first Intel C2D machine this Christmas.

Other


RE: Bit Slower than I would of liked
By surt on 11/15/2006 1:23:30 PM , Rating: 1
quote:
I do believe that AMD has more up its sleeve than it is letting on. For example if you can get HT3.0 to work all the way to the GPU on an ATI graphics card then you will definitely see a performance boost over the competitors.


That's not likely to be true. Games and graphics are generally not very CPU-GPU bandwidth limited. They are almost exclusively GPU performance limited.


RE: Bit Slower than I would of liked
By Viditor on 11/16/06, Rating: 0
RE: Bit Slower than I would of liked
By Spoelie on 11/14/2006 7:40:08 PM , Rating: 4
As far as i can tell, the stars family IS the K8L architecture


RE: Bit Slower than I would of liked
By Zurtex on 11/14/2006 9:03:21 PM , Rating: 2
Ahh right super :-)

Looking at the chart it just appeared to be a name change because they were introducing HT3.0 and AM2+


By OcHungry on 11/14/2006 7:42:08 PM , Rating: 2
yeah right...
128bit floating point, Hypertransport3, L3 shared cache, DDR2 1066, independent power management, and bunch of other (not revealed) changes/improvements are just peanuts to you...
Give me a break. According to Mr. Ruiz "it’s a killer CPU"
I wonder what he meant by that? don’t you?
The backward compatibility is very delicious. As matter of fact everything so delicious.


By leidegre on 11/15/2006 1:54:13 AM , Rating: 2
On the contrary, AMD should be able to suprise most of us. In the past they have done excellent work, and if they see the need to hold back production to meet expectations, so they should.

Both Intel and NVIDIA provide better perfomance in thier products, and that is a big challange to take on for AMD, since they now entered the graphics market to. However, I have great confidence that they will delivier, and that it's a matrue move to hold back. Instead of rushing development and increasing costs, they take the time to invest and devlope in new technology, and will strike from below again.

Over the last two years AMD har been the provider of the best CPUs, now that has shifted, and looking at this road map, it's to me more clear that AMD is taking time off, before rentering with kick-ass solutions.

Time will tell what happens. I'm physced about it, but only time will tell.


"There's no chance that the iPhone is going to get any significant market share. No chance." -- Microsoft CEO Steve Ballmer

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