CPU Voltage Reference bios setting, I'm trying to find an explanation on it, this is what I've found so far:
The CPU Reference Voltage configures the CPU Vtt voltage via preset ratios
(my motherboard being Asus P5K-SE, seems Asus is using some custom names)
Searching further:
Cpu Vtt is the fsb termination voltage and is also known as vfsb on other boards.
So... by choosing a higher preset setting (0.63x, 0.61x, 0.59x, or 0.57x) it should help achiving higher FSB? (asumming CPU isn't the problem there)
Searching further I've got this from Anandtech P5E3 review posted yesterday. In the new Asus P38 boards bios they call it: CPU GTL Voltage Reference
CPU/NB GTL Voltage Reference: CPU: Auto, 0.63x, 0.61x, 0.59x, and 0.57x. NB: Auto, 0.67x, and 0.61x. CPU Gunning Transceiver Logic (GTL) voltages are nothing more than reference levels that the CPU uses when determining if a data or address signal is either high (1) or low (0). Precision voltage dividers generate these voltages and are usually specified as a percentage of VTT. In the case of 0.67, this would be 67% of VTT. For example, if VTT is 1.20v then a CPU GTL Voltage Reference of 0.67x would result in a GTLREF value of 0.67 x 1.20V = ~0.80V.
These reference values are particularly important when overclocking quad-core CPUs, especially when venturing above about 450FSB. The ability to tune these values per die can mean the difference between 475FSB and 500FSB. Unfortunately, ASUS' implementation of this functionality is rather incomplete as manipulation of only a single GTLREF value is possible (and in a somewhat imprecise manner). The real power in GTLREF tuning comes in the ability to provide each quad-core die with separate reference values. (Recall that current quad-cores are an MCM consisting of two dual-core dies on a single package.)
I'm still not clear what this bios setting is really about. Nor what is the default setting for the CPU Voltage Reference when set on auto and which setting out of 0.63x, 0.61x, 0.59x, and 0.57x to use in order to get a slightly higher FSB.
The CPU Reference Voltage configures the CPU Vtt voltage via preset ratios
(my motherboard being Asus P5K-SE, seems Asus is using some custom names)
Searching further:
Cpu Vtt is the fsb termination voltage and is also known as vfsb on other boards.
So... by choosing a higher preset setting (0.63x, 0.61x, 0.59x, or 0.57x) it should help achiving higher FSB? (asumming CPU isn't the problem there)
Searching further I've got this from Anandtech P5E3 review posted yesterday. In the new Asus P38 boards bios they call it: CPU GTL Voltage Reference
CPU/NB GTL Voltage Reference: CPU: Auto, 0.63x, 0.61x, 0.59x, and 0.57x. NB: Auto, 0.67x, and 0.61x. CPU Gunning Transceiver Logic (GTL) voltages are nothing more than reference levels that the CPU uses when determining if a data or address signal is either high (1) or low (0). Precision voltage dividers generate these voltages and are usually specified as a percentage of VTT. In the case of 0.67, this would be 67% of VTT. For example, if VTT is 1.20v then a CPU GTL Voltage Reference of 0.67x would result in a GTLREF value of 0.67 x 1.20V = ~0.80V.
These reference values are particularly important when overclocking quad-core CPUs, especially when venturing above about 450FSB. The ability to tune these values per die can mean the difference between 475FSB and 500FSB. Unfortunately, ASUS' implementation of this functionality is rather incomplete as manipulation of only a single GTLREF value is possible (and in a somewhat imprecise manner). The real power in GTLREF tuning comes in the ability to provide each quad-core die with separate reference values. (Recall that current quad-cores are an MCM consisting of two dual-core dies on a single package.)
I'm still not clear what this bios setting is really about. Nor what is the default setting for the CPU Voltage Reference when set on auto and which setting out of 0.63x, 0.61x, 0.59x, and 0.57x to use in order to get a slightly higher FSB.
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