corey407woc

what is the difference between link/sync and 1:1. isn't link/sync 1:1 then why is there an option in bios for 1:1. which one is better?

MNiceGuy

Linked means that the speed of the memory bus increases at the same rate as the front side bus. Some motherboards allow you to overclock the memory and CPU to different ratios (ex: 5:4) or completely independently.

Synced means the memory bus and front side bus are both running at the same clock speed.

1:1 also means the memory bus and the front side bus are running at the same speed.

Front side bus on an Intel = FSB/4 since it is "quad pumped". For example, a Q6600 bone stock with its 1066 advertised fsb is actually running 266MHz.

DDR2 memory is always rated at its "effective" speed as welll; not unlike Intel's "quad pumped". Since it can do 2 operations-per-clock, it's advertised at double the speed the memory bus is actually running at. So DDR2 800 is really running at 400Mhz.

If we wanted to link and sync the Q6600 in my example to the memory in my example, we'd have to increase the front side bus to 1600 (400*4) or lower the memory to 533Mhz.

Example 1:
Q6600 @ 1600 or FSB400*4
Memory DDR2 800 (400*2)

Example 2:
Q6600 @ 1066 or FSB266*4
Memory DDR2 533 (266*2)

Some have better luck keeping it linked and synced. I personally do.

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Duckydude

The 1:1 ratio myth is all hype, you do not get any better performance just by having your FSB and your memory at the same speed. Although, it is useful to be able to use unlinked mode because your memory speed isn't dependent on how your CPU is clocked. If you cannot use/don't have unlinked mode (most people don't have the option), then overclock your CPU as much as possible (within comfort) and after that, set your RAM at the fastest stable speed .

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kpo6969

Good read on the subject of dividers and ram:
http://www.anandtech.com/mb/showdoc.aspx?i=3208&p=4

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microman

not 100% true with nvidia chipsets once you get around a 460fsb a 1:1 becomes almost 100% necessary if you wanna push farther.

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Blameless

NVIDIA chipsets can also see a modest performance advantage at 1:1, as they can skip certain parts of the clock crossing procedure. Intel chipsets do the same kind of clock crossing regardless of ratio, so for best memory performance, the highest ratio you can stably use at a given FSB speed will be the best.