What is effective memory speed?

[Daniel Recker]

I have xfx gt 220 ddr2. When i run gpu z it says 400mhz memory speed. But when i go (http://www.newegg.com/Product/Product.aspx?Item=N82E16814150446) Here it says 800mhz.. Is my card faulty? If not am i running 400mhz or 800mhz?

 

[Traciatim]

DDR2 doubles the data rate of the frequency, so technically it's running at 400Mhz but does two data transactions in each cycle so it is 'effectively' sending data like it was running at 800Mhz.

 

[Daniel Recker]

DDR2 doubles the data rate of the frequency, so technically it's running at 400Mhz but does two data transactions in each cycle so it is 'effectively' sending data like it was running at 800Mhz.

So will there be a difference betwoeen real and effective?

 

[Traciatim]

DDR2 doubles the data rate of the frequency, so technically it's running at 400Mhz but does two data transactions in each cycle so it is 'effectively' sending data like it was running at 800Mhz.

So will there be a difference betwoeen real and effective?

No, it is essentially saying the exact same thing, just describing it differently. One describes the actual frequency while the other describes the data rate that is based on the frequency. Think of it more like describing something in different units like inches or feet (example, an object that is 24" is 2') rather than different performance descriptions.

 

[Daniel Recker]

DDR2 doubles the data rate of the frequency, so technically it's running at 400Mhz but does two data transactions in each cycle so it is 'effectively' sending data like it was running at 800Mhz.

So will there be a difference betwoeen real and effective?

No, it is essentially saying the exact same thing, just describing it differently. One describes the actual frequency while the other describes the data rate that is based on the frequency. Think of it more like describing something in different units like inches or feet (example, an object that is 24" is 2') rather than different performance descriptions.

In terms of processing am i running at 800 or 400mhz? I mean when i do gaming..

 

[Traciatim]

Yes.

It depends on what you are talking about. The memory frequency is 400Mhz, the data rate is 800Mhz.... they are both describing how fast the memory goes and both are correct and normal operation.

 

[Daniel Recker]

Yes.

It depends on what you are talking about. The memory frequency is 400Mhz, the data rate is 800Mhz.... they are both describing how fast the memory goes and both are correct and normal operation.

what should i consider when gaming? memory frequency or data transfer?

 

[Traciatim]

Yes.

It depends on what you are talking about. The memory frequency is 400Mhz, the data rate is 800Mhz.... they are both describing how fast the memory goes and both are correct and normal operation.

what should i consider when gaming? memory frequency or data transfer?

I still don't think you are quite getting it... they both describe the exact same thing. It's just a different rating.