1333/1066 MHz question

JLV2k5

JLV2k5

Active Member
I have selected a processor with a FSB of 1333MHz and would like to select a mb with the same speed. All of the boards on newegg are 1333/1066. Does this just mean that you can use a processor with the lower speed as well as 1333? help.

Thanks.
 
P

PC eye

banned
What that would mean is that a Socket 775 P4 with the lower front end will run on the same board where a Core 2 sees the faster fsb. The specifications seen there or at the manufacturer's own page seeing a link at newegg will list which series of cpus are supported.
 
Geoff

Geoff

VIP Member
Yes, if a motherboard is advertised as 1333/1066, then it can support processors with both of those bus speeds. They can usually support 800/533 bus speeds as well.

If a motherboard only states 1333, chances are it supports 1066 and 800 at least as well.
 
JLV2k5

JLV2k5

Active Member
PC eye said:
The memory installed will play some role as well as the cpu selected. The memory standard on the board show the speed that a faster memory will be slowed down to when run on it. One example of a 1333 fsb with a memory standard of 1066 is the Asus model seen at http://www.newegg.com/Product/Product.aspx?Item=N82E16813131190
Click to expand...

Well this Mb and ram situation happens quite frequently. I see tons of 1333/1066 boards with DDR2 800 RAM. Does this mean that the CPU and MB have to slow down to cater to the memory? Thanks

This is difficult for me to see. Everyone uses DDR2 800 due to the lower price. HELP
 
Last edited:
P

PC eye

banned
The first place to start is the board itself to see what that supports. If it runs DDR2 800 as the standard the fsb will be lowered when running 667mhz memory. For 1066 if supported will still see the 800 memory's speed and run at the same fsb as the 800mhz memory would. The "memory standard" is the actual fastest stock speed of memory while a board may easily run a faster speed of memory like seeing 1066 on an 800 model.

For most boards now the value type memory will go right in and be seen and run at the same speed while performance memory with lower latencies/faster timings often require you to manually enter those in the dram timing section of the bios. That can also included manually setting the speed rather then leaving it set on auto there.

Back to the board specifications to see what cpu is supported according to socket type seen there. On Intel Socket 775 boards many see Celerons, P4s, and Core 3 Duos while others see P4s, Core 2 Duos, Core 2 Extremes. Some also still include the Celerons as well.
 
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