IS 1866MHz or more FSB ram will work at 1866MHz or 2000MHz with i5 3550 CPU

jayadratha

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If I use a 1866MHz ram or 2000MHz ram with a i5 3550 CPU is those ram will work at 1866MHz or 2000MHz FSB? i5 3550 CPU's FSB is 1600MHz thats why I'm confused.. Please help
 

jayadratha

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Yes sorry. CPU have no FSB. motherboard have. so if I have a motherboard with 1600FSB then will a 1866MHz ram will work at 1866MHz???
& as per I know in intel website they said that i5 3550 supports 1600/1333MHz rams.
 

jayadratha

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I have two questions:
1. If I have a 1600 FSB motherboard then a 1866MHz or more speed rams will work at 1600MHz i.e at max FSB of motherboard. right??

2. Peripherals connected to north bridge or FSB of motherboard can not work with a speed which is more than motherbords's max FSB. On that case the peripheral will be downclocked. right??
 

Sakkura

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1. There is no FSB. On an LGA 1155 motherboard, everything runs off the BCLK (100 MHz). Memory has a multiplier, and the motherboard comes with a maximum multiplier.

2. There is no northbridge or FSB! Intel moved some of the northbridge functions onto the CPU, the rest were moved to what used to be the southbridge (they call it the PCH now). The memory communicates directly with the CPU, because that's where the memory controller is now. So there's no longer any FSB limitation on the memory.
 

jayadratha

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Ok.. thats why on intel website they didn' mention about FSB. Only mentioned that 1333/1600MHz ram will work. So If I will use 1866MHz ram then it will be waste of money. right??
 

Sakkura

Illustrious

1333/1600 is what will always work. But the motherboard manufacturers can implement higher speeds if they choose to. So it's just a matter of checking the manufacturers specification for each motherboard model and seeing what they say about maximum memory speed.
 

jayadratha

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North bridge is integrated to CPU itself so I think max memory speed is dependend with CPU's inbuilt memory controller. in case of i5 intel said it is 1333/1600
 

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