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Ram Bandwiths Problems


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Hi i am josh.

 

i have a slight problem, the bandwith of the ram i am using [ddr2 6400 @ 900mhz [overclocked by 100mhz]] should have a bandwith of 6.4gb/s it said on the box. but even overclocked from 800mhz to 900mhz it is still only, 4.9gb/s and at 800mhz it is only 3.5gb/s.

 

Rig spec

 

M/B Abit Fatal1ty FP-IN9 SLI [its a 650I chipset]

 

ram 2X1GB of 800mhz geil pc2-6400 and then 2X1GB of 800mhz A-data pc2-6400. all 4GB of which is running at 900mhz

 

Cpu E4400 @ 2.00ghz X2 2mb l2 cache.

 

 

its just the ram should be pretty fast but it only gets 4.8 on the vista speed think and it is the slowest part of my computer so i was planing on upgrading but if the M/B is busted or somthing then i can't.

 

thanks.

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What are you using to find the bandwidth? and the overall FSB of the system is going to dictate the bandwidth not so much the speed of you memory.

 

The pics i attached should explain the effects of a higher FSB equating to a higher bandwidth.

post-30192-1225544918_thumb.png

post-30192-1225544925_thumb.png

post-30192-1225544933_thumb.png

post-30192-1225544974_thumb.png

Edited by bg8780

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i am using sisoftware sandra - the free vertion.

 

and to change the speed of the ram i was changing the FSB to change the speed [800mhz to 900mhz]. which is interesting becaues the CPU didn't go any faster, i left the FSB:QRD on auto or on independent but i think it is on 1:1.

 

also, if 2GB of 6400-2pc should have a bandwidth of 6.4GB/s shouldn't 4GB have a bandwidth of 12.8GB/s ? and so my 3.75GB/s is even worce.

 

 

i hope that helped =]

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i am using sisoftware sandra - the free vertion.

 

and to change the speed of the ram i was changing the FSB to change the speed [800mhz to 900mhz]. which is interesting becaues the CPU didn't go any faster, i left the FSB:QRD on auto or on independent but i think it is on 1:1.

 

also, if 2GB of 6400-2pc should have a bandwidth of 6.4GB/s shouldn't 4GB have a bandwidth of 12.8GB/s ? and so my 3.75GB/s is even worce.

 

 

i hope that helped =]

 

:withstupid:

 

He is right more ram does not mean more bandwidth. If I had 2gig stick that ran at 400mhz DDR800 PC6400 and then I added another 2gig stick same specs as my current one all I would do is make my total amount of ram would be 4 gigs the bandwidth stays the same.

 

You shouldn't be worried about ram bandwidth so much because in most cases having really fast ram does not give you a large performance increase.

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  • 2 weeks later...

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