Athlon II X2: Hardware C1E and Return of the CnQ Bug I noticed something strange in my initial testing of the Athlon II X2, take a look at these SYSMark results: Processor SYSMark 2007 Overall AMD Phenom II X2 550 BE (3.10GHz) 167 AMD Athlon II X2 250 (3.00GHz) 134 AMD Athlon X2 7850 (2.80GHz) 145 The Athlon II X2 250 is slower than the Athlon X2 7850 and significantly slower than the Phenom II X2 550. Remembering from the original Phenom processor I decided to turn CnQ off in the BIOS to see if the scores would go up: Processor SYSMark 2007 Overall - CnQ On SYSMark 2007 Overall - CnQ Off AMD Athlon II X2 250 (3.00GHz) 134 148 Indeed they did. I contacted AMD and was informed that there’s more than meets the eye with the Athlon II X2. Although the architecture is fundamentally a couple of Phenom II cores with larger L2 caches and no L3, there’s one more change to the die: microcode support for the C1E power state.
The format and flow of the game, as well as the categories and questions, follow the TV show very closely--right down to the Jeopardy, Double Jeopardy, and Final Jeopardy progression--with one major exception: all questions (er, 'answers,' in Jeopardy-ian argot) are multiple choice, making the game arguably easier than actual Jeopardy. The sims deluxe edition for mac. You can also play alone, but the game is at its best when playing with other human players on the same computer, with each person assigned his own response key. That also influences how you play against computer opponents (set to easy, medium, or hard, with likewise customizable appearance), as speedy responses are rewarded disproportionately. Given that Jeopardy has already been done repeatedly for the Mac, it's disappointing to see occasional video glitches and so few innovations (why no online play option, for example?).
Fuji xerox docucentre iii 3007 drivers for mac. When the OS executes a halt instruction on a CPU (during a period of no activity for example) the clock signal is shut off to the CPU for a period of time. Unzipper 1.0.00 for mac. This saves power as no transistors are actively switching during this time. Voltage supplied to the processor is left unchanged however. This power state is known as C1. In the late Pentium 4 era Intel introduced an Enhanced Halt State, called C1E. Instead of just shutting off the clock to the CPU, when a CPU was in C1E its clock speed and voltage would both be reduced to their lowest possible value.
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The reduction in voltage results in a reduction in leakage current, which in turn saves power. Apparently prior to the Athlon II X2, AMD enabled support for C1E outside of the processor. Although I tried, I couldn’t get access to anyone at AMD to explain things any further so what I offer is my best guess. I’m guessing that whenever a halt instruction was executed by the OS, AMD used some combination of its existing C1 support and Cool’n’Quiet to both stop the clock to the CPU and reduce voltage. Regardless of how AMD enabled it, motherboard makers were constantly botching it up in their BIOS which would result in different motherboards having very different power consumption levels especially at idle. It appears that some vendors were properly enabling this software-hack C1E state while others weren’t.