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Back to UserFriendly Strip Comments Index
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I can't believe i'm going to ask this here | by Glytch78 | 2002-10-18 07:30:02 |
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AMD with DDR. | by caffine-iv | 2002-10-18 07:34:41 |
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AMD XP 2400 vs Intel P4 2.4Ghz@533 | by Glytch78 | 2002-10-18 07:36:50 |
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GHz wise, the P4. Power wise, the 2400. | by caffine-iv | 2002-10-18 07:38:59 |
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EH?? | by Glytch78 | 2002-10-18 07:42:14 |
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No, they're not the same. | by caffine-iv | 2002-10-18 07:45:43 |
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That's the XP2400 vs the p2.4 right? | by Glytch78 | 2002-10-18 07:49:34 |
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it is all in the FSB | by cartvader1 | 2002-10-18 07:59:45 |
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It's not all in the frontside bus. | by caffine-iv | 2002-10-18 08:02:40 |
| Why does a fast bus have to be narrower? |
by taIon |
2002-10-18 09:25:27 |
Given the same bus width (size of bucket) more speed is always going to make a difference. Just not very much difference.
One thing that they like to hide is the latency of any bus, that is how long between the processor first asking for data and the data starting to arrive.
Think of the bus/memory like a store room with a conveyor belt going out to the front room. When the front room (the processor) wants something they put its location on the belt (the bus) and send it to the store room. The person in the store room wanders around for a while, finds the right shelf and puts the box on the conveyer belt out to the front room.
How fast the belt goes (the bus bandwidth) is only going to make a small difference to the total time taken to get what you want from the store room. How long the person there takes to find the item is the limiting factor. The time it takes the request to get to the store room is considered the latency of the bus, how long it takes to find the right item in the store room is the latency of the RAM.
To get over this problem computers use burst transfers. This is the same as the man in the store room sending back everything on the same shelf as the item that was asked for just in case it will be needed. Since all the initial delays are the same the speed of the conveyor belt now starts to matter since that limits how long it takes to send the entire contents of the shelf.
Rambus has a high bandwidth (fast conveyor belt) but also high latency (very slow man in the store room). In some situations this makes it faster, in others slower.
So basically a faster bus is good, especially for things that use large blocks of data (e.g. graphics in games) but since all memory has much the same latency don't expect a huge impact just a few percent.
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