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Ok, I am using Aida32 to see some settings for a new PC that I have. I am trying to see what my FSB and Memory are running at, but am a bit confused about the meanings behind effective clock and real clock. I am running an AMD 2800 and PC 3200 Ram.
Aida32 shows the following:
Front Side Bus.. "Real Clock: 167 MHz(DDR)"
"Effective Clock: 333MHz"Memory Bus Properties.. "Real Clock 233MHz(DDR)
"Effective Clock 467 MHz"
I am trying to figure out what my computer is running at currently.
I appreciate the help in advance.
Druss
Originally one clock cycle read one bit of data. One cycle goes from, zero to positive and back to zero and zero to negative and back to zero.
With DDR, data is read on both the positive cycle and again on the negative cycle, giving you two bits per cycle.
167 X 2 = 333
233 X 2 = 467..or as near as makes no difference. So although the clock is running at one frequency, data is being read at twice the speed - hence DDR.
Stuart
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Stuart, that is very intersting information, but you disected my question a little too much. No offense intended. :) I just need to know what my computer is currently running at. I don't know if the real clock is what it is currently at, or if the effective clock is what it is runing at.
Druss
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"I just need to know what my computer is currently running at"
the cpu is running at stock speed, which is 12.5x166=2083mhz
your memory spd sounds like its 233mhz, which makes it pc3700 not pc3200
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Stuart, computer levels go from positive to zero. They never go negative. There are only two (binary) levels, on and off.
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The memory clocks on the leading edge of the pulse and the trailing edge of the pulse, ie. the positive transition and the negative transition. Hence, double the pulse (clock) rate.
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Dude, I know this is a difficult concept...but the answer to your last question is "both". Your "real" FSB is 166mhz but since it's "double-pumped" on an AMD system, it's "effectively" running at 333mhz.
I don't know if the memory clock numbers that you're getting from Aida32 are "real" (as in, that's what your memory is actually clocked at)...or if they're "potential" (as in you actually have PC3700 RAM)
PC2100 aka DDR266 runs at 133mhz
PC2700 aka DDR333 runs at 166mhz
PC3200 aka DDR400 runs at 200mhz
PC3500 aka DDR433 runs at 217mhz?
PC3700 aka DDR466 runs at 233mhzI was wondering how you have the CPU:RAM ratio set? You may have it at 4:3 instead of 1:1?
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Squint
We are talking about analouge frequncies here which do go negative. If there was no negative componant to an analouge frequency it would be a pulsed DC current until you feed it through a smoothing capacitor.
Clock frequencies are AC in the same way that mains voltage is AC.
In fact there are three binary levels, on off and dont know. You can have reverse polarity logic where 0 = Ov and 1 = -5 volts. Common is RS 232 signaling where +3 to + 12v = 1 and -3 to -12v = 0. +2 to -2v is dont know.
Memory uses reverse polarity logic internally. That is why it has both posative and negative voltage supplies.
Stuart
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