05-14-2006, 09:12 AM
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#1
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Member (10 bit)
Join Date: May 2005
Posts: 561
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Did AMD revise?
As I was browsing Newegg's processor selection, I noticed something wierd about the AMD processors they were displaying. Rather than showing 800mhz HT, it was showing 1600, and instead of 1000 it was 2000. Did AMD revise their processors, or is it just how they are reporting them now?
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05-14-2006, 10:00 AM
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#2
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Member (14 bit)
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Join Date: Jan 2002
Location: The Great NorthWest
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Pretty interesting. For giggles, I checked one at random at AMD's site here to see if it was a typo at Newegg's site: seems it's at least the way AMD is reporting it. Don't know if they've "revised" them or not...
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05-14-2006, 10:03 AM
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#3
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Forum Administrator
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They are now showing the double pumped HT bus speed.
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05-14-2006, 11:51 AM
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#4
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~ Ryan ~
Join Date: Jun 2005
Location: Jackson TN
Posts: 3,516
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Makes it seem faster! - Nice little trick 
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05-14-2006, 12:04 PM
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#5
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Member (10 bit)
Join Date: Jun 2005
Location: Sterling Heights, Michigan
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I never understood what made that bus "double pumped", samething with DDR RAM. Can anyone clarify?
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05-14-2006, 06:47 PM
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#6
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Member (10 bit)
Join Date: May 2005
Posts: 561
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They are only doing it for some of them, which is odd.
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05-15-2006, 12:07 AM
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#7
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Moderator
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Double-pumped means that the bus or chip reads/sends data two times per clock cycle instead of just one. Quad-pumped means it sends the data four times per clock cycle. So in the case of DDR400, it's really running at 200 MHz, but because it sends data twice per hertz, its effective speed is 400 MHz.
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05-15-2006, 08:44 AM
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#8
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Tweak Monster
Join Date: Sep 2003
Location: indiana
Posts: 2,769
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The 800-1600 are the 754pin cpus and the 1000-2000 are the 939 cpus
They have been this way for a while...listing both the single pumped and double pumped info... I think is adds more confusion to some as they still dont know how they get that number and what sets it...?
The numbers are the effective speeds of the hypertransport bus...
On a 754 the math is: 200 (fsb) x's 2 (for ddr) = 400 x's 4 (LDT multiplier) = 1600mhz HT
939 is the same except the LDT multiplier is x's 5.... 400 x's 5 = 2000mhz HT..
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05-15-2006, 09:47 AM
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#9
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Member (10 bit)
Join Date: May 2005
Posts: 561
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So in practice my Venice core that I bought a year ago is running at 2000Mhz HT, rather than 1000 as it was initially advertised? I'm confused as to whether the numbers they are reporting are the practical HT readings. According to the formula you posted, it should be...
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05-15-2006, 10:16 AM
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#10
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Forum Administrator
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HTT is a 1000 bus (base motherboard FSB 200, with a x5 LDT multiplier), double pumped to 2000. Your DDR400 ram is FSB 200, double pumped to 400. Everything relates back to the motherboard FSB, which is 200 unless you overclock it.
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05-15-2006, 12:02 PM
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#11
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Member (10 bit)
Join Date: Jun 2005
Location: Sterling Heights, Michigan
Posts: 892
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Ah! thanks, i got it.
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