motherboard supports max 333FSB ram but how I'm using 400 FSB ram

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jayadratha

jayadratha

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I have a very old motherboard. P4 motherboard. Manual said that it supports DDR266, DDR333 RAM. But I am using 2 zion set of ram in which written PC400. I think motherboard supports max 333FSB ram. then how I'm using 400 FSB ram??
Please help me. I need this info...
 
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blader15sk8

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You can put faster RAM into your PC, but it will only run as fast as the slowest stick of memory in your system. Also, it will only run at the maximum speed your motherboard allows without overclocking. So just because you put PC400 memory into your PC, doesn't mean it is running at PC400 speeds. If you look at the POST messages when you boot up your PC it should tell you the actual speed it is running at. Either that or you can run CPU-Z and check with that.
 
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raytseng

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"the ram's fsb is lowered". <-not right way to think of it.
Ram doesn't have an fsb. it has particular ratings.

Think of it like tires for your car. You can get expensive tires with high speed ratings. You can still drive those tires at lower speed.
 
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jayadratha

jayadratha

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Yes. I saw that DRAM frequency is 133MHz in CPU-Z, where as a DDR 400FSB ram shoul work at 200MHz due to dual data rate. But working at 133MHz that means motherboard manufacturers tells the max FSB of the ram supported by the motherboard. If I connect low FSB ram then no problem and if I connect a ram greater than the max FSB supported by the motherboard then that ram's FSB will be lowered to the max FSB supported by the motherboard???
 
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raytseng

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Again RAM does not have an FSB "speed" it is a rating.

The FSB is the speed of the motherboard; like the speed of your car.
Your ram is like your tires, which are rated to go at certain speeds.
Your tires don't go at a different speed than your car.

Faster ram is backwards compatible and can run at slower speeds, just like tires.
 
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jayadratha

jayadratha

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Ok, but one of my friend have a motherboard, and it supports 1333FSB, but when he used 1600FSB ram it didn't support. Why??
 
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