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Incorrect memory bandwidth ?

C

chaotic_uk

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why has the memory bandwidth dropped from 76.8 to 75 ?

 
blkhogan

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Thats about normal. I have my 5770 clocked a little over yours and mine isnt much higher.
 
C

chaotic_uk

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it has only dropped with the latest version , when i change the memory to 1250 the bandwidth was 80.0gb/s but @ stock it has always read 76.8

 
W1zzard

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see the changelogs
 
C

chaotic_uk

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why the change ? , it has always read gb/s has it not ? . so your readings are differant to ati's , is the change cause of the gtx4** series ?
 
W1zzard

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it has labeled it GB/s but calculated GiB/s .. now it calculates what it claims

before: wrong, now: right .. now: lower ... would you prefer to see the wrong number?
 
W1zzard

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actually .. is the number still too high ?

1200 mhz are 1,200,000 hz * 128 bit = 153,600,00 bits per second * 4 (gddr5) = 614,400,000 bits per second / 8 (bits per byte) = 76,800,000 bytes / 1024 (mbytes) = 75,000 / 1024 (gbytes) = 73.242

anything wrong with that ?
 
C

chaotic_uk

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no but why do ati claim 76.8gb/s , it says this amount in the hardware info in ccc
 
W1zzard

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they divide by 1,000,000,000
 
C

chaotic_uk

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so it's like harddrives then , ah i see now ;)
 
skylamer

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:d)
 
dr emulator (madmax)

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if i where you boss i would just say it's more accurate now where people download it from
so you won't have to do all the explaining over and over, just my two cents
 
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