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post #51 of 76
Thread Starter 
So if you have a processor with 1066fsb and your ram is 800mhz. That means your processor can send data at 1066mhz but your ram can only respond it 800mhz. therefore your ram is slowing down your processor?
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post #52 of 76
remember, the 1066 represents the quad pumped fsb of 266, you could think of the memory as being dual pumped so an fsb of 266(1066) only needs 533 mhz memory. As you start raising your fsb to overclock, it raises the minimum speed needed for your memory.

Take an E6600 intel chip
STOCK:
266 FSB quad pumped = 1066
multiplier of 9 = 2.394 Ghz
memory runs at 533 (266x2)

Overclock to 3.6
400FSB quad pumped = 1600
multiplier of 9 = 3.6Ghz
memory runs at 800 (400x2)

This is part of why the 4300 was a popular choice for overclocking, it's FSB was 200 so you could use slower hence cheaper memory to get decent overclocks
STOCK:
200 FSB quad pumped = 800
multiplier of 9 = 1.8 Ghz
memory runs at 400 (200x2)

Overclock to 3.0
333 FSB quad pumped = 1332
multiplier of 9 = 3.0 Ghz
memory runs at 666 (333x2)
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post #53 of 76
Yeah you gotta remember about the quad pumped FSB and the DDR2.
1066/4 = 266.5
800/2 = 400
post #54 of 76
Thread Starter 
quad pumped meaning that it is sending and receiving data from 4 different areas?

so each has data transfer rate of 266.5mhz to and from the ram, the pci slots, theharddrive,and the graphics card.

So in return , the ram can send data at 800mhz but the processor can only respond it at 266.5 mhz. This doesnt seem right.
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post #55 of 76
Quote:
Originally Posted by brherper View Post
quad pumped meaning that it is sending and receiving data from 4 different areas?

so each has data transfer rate of 266.5mhz to and from the ram, the pci slots, theharddrive,and the graphics card.

So in return , the ram can send data at 800mhz but the processor can only respond it at 266.5 mhz. This doesnt seem right.
Alright here is what you have to understand about this quad pumped and DDR2 *double rate data*.

From Wiki, this is a very good way to explain, and what i have been trying to think of.

Quote:
Quad data rate (or quad pumping) is a communication signalling technique wherein data is transmitted at both the rising and falling edges of signals much the same way DDR technology works, but with two signals 90° out of phase from each other, effectively delivering 4 bits of data per clock cycle. The technology was introduced by Intel in their Willamette core Pentium 4 CPU, and is currently employed in their Pentium 4, Celeron, Pentium D, and Core 2 Processor ranges. This technology has allowed Intel to produce chipsets and microprocessors which can communicate with each other at data rates expected of the traditional Front Side Bus technology running from 400Mhz to 1333Mhz, while maintaining a lower and stable actual clock frequency of 100-333Mhz.
Remember it is DDR2, 800MHz is it's effective speed, it's true speed is 400MHz, and your FSB would be at 266.5MHz

And yes, having your ram running faster than your FSB is not very beneficial, 1:1 ratio ftw.

It's the same deal for DDR2
Quote:
In computing, a computer bus operating with double data rate transfers data on both the rising and falling edges of the clock signal, effectively nearly doubling the data transmission rate without having to deal with the additional problems of timing skew that increasing the number of data lines would introduce. This is also known as double pumped, dual-pumped, and double transition
post #56 of 76
Thread Starter 
for some reason i am not understanding it yet. Explaining it like that and that type of quote just throws me off with the bigger words im not used to hearing.
About the ram. if its 800mhz, why is it really 400mhz like you said above?


ok, So the processor sends 4 bits of information per cycle at 266.5mhz each which equals to the 1066mhz. What is considered one cycle?


The ram speed has nothing to do with the FSB, its just the speed at which the ram can function on its own?
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post #57 of 76
Quote:
Originally Posted by brherper View Post
for some reason i am not understanding it yet. Explaining it like that and that type of quote just throws me off with the bigger words im not used to hearing.
About the ram. if its 800mhz, why is it really 400mhz like you said above?


ok, So the processor sends 4 bits of information per cycle at 266.5mhz each which equals to the 1066mhz. What is considered one cycle?


The ram speed has nothing to do with the FSB, its just the speed at which the ram can function on its own?
The clock that computers use is a square(ish) wave form. It is a pulse of electricity that stays on for a time and off... on/off... over and over at a set interval. One full on or off period is a cycle. This is how all components in the computer synchronize. Double Data Rate memory does TWO things within this one pulse or cycle. Quad pump does FOUR things in this one cycle.
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post #58 of 76
Quote:
Originally Posted by brherper View Post
well then what is ram for? what makes it different then the ram built in the processors?
RAM is a form of storage that the CPU needs to refer to to run applications. The internal cache of CPU's and other devices are intended as a buffer for data that is yet to be processed as most processors are capable of executeing data faster than the system bus can feed it.
post #59 of 76
BTW, the reason that we do not have lots of L1 cache is cost. The faster the memory, the MUCH more expensive it is.

Here is how the cache structure will look by the end of year. I am also estimating how much a $100 would get you of each. Note that you get a near magnitude more with each lower level. However, each higher level is almost 10-100 times faster.
L1, 1MB
L2, 30MB
L3, 100MB
RAM, 1GB
Flash, 8GB
Hard Drive, 200GB
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post #60 of 76
Quote:
Originally Posted by Dezixn View Post
Yeah you gotta remember about the quad pumped FSB and the DDR2.
1066/4 = 266.5
800/2 = 400
You got DDR2 wrong... DDR = Double Data Rate. The DDR2 is simply just because it's using another technology.
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