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BOINC Blaster
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10. October 2009 @ 16:27 |
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10. October 2009 @ 16:31 |
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Originally posted by sammorris:
DDR3 memory has high latencies because the actual memory chips themselves are no faster than even old DDR1, memory technology has not progressed at all in the last few years. The only change is the speed at which the memory interfaces with the CPU. High memory clock speed is a good thing as it allows for higher bandwidth, but because the limitation is the memory chips themselves, a job can only be completed so fast.
Old PC3200 DDR1 (400mhz) can do a job in just 2 clock cycles (CAS2), which is 5ns.
PC6400 DDR2 (800mhz) can do a job in 4, and PC8500 (1066mhz) in 5 - this is 5ns and 4.7ns.
PC13333 DDR3 (1600mhz) can do a job in 8, which again, is 5ns.
So what, exactly, is the advantage to having the fast DDR3 memory if the end result (if I understand you correctly) is the same as using slower DDR1 or DDR2 memory? I'm seeing DDR3 memory with over 2100MHz speeds. Why??
Dick
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10. October 2009 @ 16:58 |
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Then that's wrong, or you're using a QX9650 which is not the same chip.
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10. October 2009 @ 18:01 |
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Originally posted by sammorris:
Then that's wrong, or you're using a QX9650 which is not the same chip.
With all due respect, Sam, it is correct. There is a BIOS performance setting called "Half Ratio Multiplier" that when Enabled, adds 0.5 to whatever the Processor Multiplier is set to. The BIOS calculation of Processor Speed and System Bus Speed all agree with 3.8 GHz and 1600 MHz. The BIOS also agrees that the processor is a Q9650, not a QX9650.
I have some very fuzzy cellphone photos of the BIOS screen if you don't believe what I am saying.
Dick
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10. October 2009 @ 18:05 |
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Perhaps that's a bizarre feature that your intel board has, but I assure you, 99% of cases, that's not the case. The 0.5X fine tune multiplier only allows subtraction, not addition.
Run CPUZ, I'm curious.
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10. October 2009 @ 18:29 |
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Originally posted by sammorris:
Run CPUZ, I'm curious.
CPU-Z reports 9.0 @ 3.6 GHz.
So is Intel resorting to some marketing slight-of-hand or is CPU-Z missing something?
Dick
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10. October 2009 @ 18:41 |
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Originally posted by k7vc:
So is Intel resorting to some marketing slight-of-hand or is CPU-Z missing something?
...or could there be a bug in the Intel BIOS calculation routines that mistakenly add the 0.5 multiplier in all their calculations, without realizing that the processor itself never went there!?
Dick
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10. October 2009 @ 19:59 |
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The intel program is bugged I expect. The +0.5x does not work unless you have a CPU with an unlocked multiplier, i.e. a QX (9650 or 9770). CPUZ is almost always spot on with CPU speed.
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10. October 2009 @ 20:05 |
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Originally posted by sammorris:
The intel program is bugged I expect. The +0.5x does not work unless you have a CPU with an unlocked multiplier, i.e. a QX (9650 or 9770). CPUZ is almost always spot on with CPU speed.
OK. I have reported the bug to Intel where I am sure it will be ignored, but at least I have done my citizenly duty to report it. One would hope that a manufacturer's software designed for that manufacturer's hardware would provide accurate reports. ::sigh::
Oh, well, I shall stop bragging about my 3.8 GHz build. :(
Thanks for putting me straight.
Dick
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AfterDawn Addict
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10. October 2009 @ 20:05 |
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Get the FSB up a notch, shouldn't be hard :)
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11. October 2009 @ 14:56 |
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As a final postscript to this thread, I decided to return all board settings to default for the long-term. After running OC'ed for a week, a started to get a bit concerned with the continual aroma of hot PCB in the room (even though all temp sensors were happy).
On the Intel desktop console I selected "Default" and rebooted the board. It came back up reporting 3.16 GHz and still reporting a 9.5 multiplier. Apparently the "Half-Ratio Multiplier" defaults On, thus resulting in a defaulted bus speed of 3.16 GHz.
I turned the Half-Ratio Multiplier off and everything went back to 3.0 GHZ (which is what both the board and processor are spec'ed at).
It looks like a simple bug in the very latest and greatest BIOS for this board where the BIOS tells the processor to operate at 9.5 and the processor looks back like my dog does when I tell it to fix dinner: "Say what??"
Thanks for the help, Sam. Arguing a point is always a good way to learn, even if your point is wrong. I learned a lot.
Dick
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11. October 2009 @ 15:02 |
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No worries, don't think of it as arguing, you weren't to know really, it's confusing when programs do things like that.
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