Wikipedia articles on this topic use the unambiguous but less familiar "MT/s" units. Intel (and AMD) chose to continue describing bus speeds in MHz because it was familiar to customers, even though with the advent of double-pumping it was no longer precisely accurate (and, as your example shows, can be very confusing even to people familiar with the topic). This is then quad-pumped to 667 MT/s (or as quoted by Intel, 667 MHz). Why do we insist on MT/s?Ī Pickle ( talk) 04:26, 29 June 2009 (UTC)įirst a T7200 667 mhz fsb IS a quadpumped 166mhz FSB, The northbridge and the cpu are at 667mhz but transfer in between is at 166mhz.- Transisto ( talk) 06:22, 29 June 2009 (UTC) The actual clock driving the bus in your T7400 example is 166 MHz. Intel's own materials clearly show processor specifications listed in MHz, not MT/s. This would mean that a Core 2 Duo T7400 (2.16 GHz core clockspeed, 667 MHz front side bus clockspeed) would NOT (as this article indicates) possess a front side bus capable of 667 MT/s, but rather would possess a front side bus capable of 2668 MT/s (4 * 667).Īpart from being wholly incorrect, the use of MT/s for measuring the speed of the front side bus of the Core 2 processors is simply wrong.
Well, the Core 2 line of processors uses an AGTL+ "quad-pumped" Front side bus, which performs four transfers per clock cycle. If its internal clock runs at 100 MHz, then the effective rate is 200 MT/s, because there are 100 million rising edges per second and 100 million falling edges per second of a clock signal running at 100 MHz." One example is a computer bus running at double data rate where data is transferred on both the rising and falling edge of the clock signal. The Wikipedia page for Megatransfer states, quote: "The units usually refer to the "effective" number of transfers, or transfers perceived from "outside" of a system or component, as opposed to the internal speed or rate of the clock of the system. In the past, I have gone through and edited the unit of measure used to quantify the speed of each CPU's front side bus from "MT/s" (megatransfers per second) to "MHz." Usually my edits would be reverted within the hour, back to "MT/s." I haven't bothered to change anything here this time, but I have to ask: Why are we using that unit of measure, and moreover, why are we using it incorrectly? 20 does the core 2 line support multi socket boardsįront side bus quantities: MHz or MT/s?.7 Possible inaccuracy about Conroe and Allendale cores.
1 Front side bus quantities: MHz or MT/s?.