confused about athlon64 htt

[Raspewtin]

I have a 939 athlon64 on a Asus A8v. When I load up cpu-z it says my htt is 200. I thought Hypertransport is 1000 on this? Sorry if this is a dumb question. Thanks for help

 

[Avalon]

HTT is the "FSB" of an A64 system. It runs at 200mhz, and there is also some sort of HTT multiplier (I think?) that determines the final speed, such as 1000. You'd have to run at 200x5 HTT to get 1000, but I think most boards only do 800 max, officially. Might want to wait for someone more technical to answer.

 

[zephyrprime]

Yes, there is a multiplier. I think it's 4.

I think only the PCI-Express MB's have 1000GHz hypertransport but I could be wrong.

 

[Yanagi]

The HTT is comparable to the FSB. the HTT then has its own multiplyer which I believe is called LTD. so HTT x LTD = your hypertransport speed. I believe the LTD is default at 4x which would be 200x4 = 800 x(duplex)2 = 1600 mhz or 1.6 GHz..

However correct me if Im wrong since i still dont own an AMD64 setup. this is from what I've read and im still not 100% sure i comprehend it 100%

 

[imported_michaelpatrick33]

The new 939 processors and boards support the HTT of 200 x 5 but you won't really notice any difference between that and 200 x 4. It is simply a base generator that regulates the frequencies of the memory, cpu and connection to the northbridge

 

[MoobyTheGoldenCalf]

Asus A8V has 1000 HTT. There is a setting in the bios where you can set what multiplier you want to use.

 

[Tiamat]

Sorry, im uneducated in A64.

What exactly is the purpose of the LDT multiplier? The ram uses the HTT (200mhz). What uses the muliplied number?

 

[Tiamat]

anybody know what the purpose of the multiplied number is in A64s?

 

[Nyati13]

Originally posted by: Tiamat
anybody know what the purpose of the multiplied number is in A64s?

The HTT link is the communication between the CPU and the Southbridge (remember, in A64 systems there is no Northbridge, VIA chipset have an AGP bridge chip, and a Southbridge, Nvidia has a combined AGP/Southbridge single chip).
The CPU internal clock gen is 200MHz (This can be called the FSB, but that in fact is incorrect, it is only a clock generater, not a data bus, or memory bus).
Based on that, everything else is clocked according to multipliers. The CPU will clock at *x200 (say 10x200 for the A64 3200+ /1 Meg). The memory controller will run 1:1 for DDR 400 (PC3200) or 5:4 for DDR 333 (PC2700). The HTT will run at 4x200 for the standard HTT speed, or 5x for the newer 1000 HTT link that the Socket 939 chips can support. The HTT link can also be multipliered down to 3x for overclocking the internal clock.

Jeremy

 

[Tiamat]

Originally posted by: Nyati13

Originally posted by: Tiamat
anybody know what the purpose of the multiplied number is in A64s?

The HTT link is the communication between the CPU and the Southbridge (remember, in A64 systems there is no Northbridge, VIA chipset have an AGP bridge chip, and a Southbridge, Nvidia has a combined AGP/Southbridge single chip).
The CPU internal clock gen is 200MHz (This can be called the FSB, but that in fact is incorrect, it is only a clock generater, not a data bus, or memory bus).
Based on that, everything else is clocked according to multipliers. The CPU will clock at *x200 (say 10x200 for the A64 3200+ /1 Meg). The memory controller will run 1:1 for DDR 400 (PC3200) or 5:4 for DDR 333 (PC2700). The HTT will run at 4x200 for the standard HTT speed, or 5x for the newer 1000 HTT link that the Socket 939 chips can support. The HTT link can also be multipliered down to 3x for overclocking the internal clock.

Jeremy

So, this "800HTT and 1000HTT" used by the Processor to Southbridge/graphics communication only. Thx

 

[thelanx]

How does this compare to the "quad-pumped" bus on the p4 systems? Is it the same principle? Also, is intel's quad pumped bus duplex or half duplex? If it is half duplex at 800mhz, then the AMD systems with 800mhz HTT would have effectively twice the bandwidth right?