btw
quote
http://en.wikipedia.org/wiki/GDDR5

GDDR5 (Graphics Double Data Rate, version 5) SDRAM is a type of high performance DRAM graphics card memory designed for computer applications requiring high bandwidth. Unlike its predecessor, GDDR4, GDDR5 is based on DDR3 SDRAM memory which has double the data lines compared to DDR2 SDRAM, but GDDR5 also has 8-bit wide prefetch buffers similar to GDDR4.

gddr5 is really ddr3 for the most part and is bubble data rate not QDR

can you see the lie yet ?

quote
http://www.anandtech.com/show/2232/5

Unbuffered results show the same basic pattern as buffered results in this case. Here DDR3 is clearly the best performer at the same slow timings at DDR2-800, with DDR2 on the P35 behind about 3% and DDR2 on P965 about 12% lower. DDR2 is still faster at the better timings available with current DDR2 memory.

ddr2 vs ddr3 {gddr5}
ddr2 is at most 12% slower

math doesn’t add up douse it on the effective speed improvement …duh…

ddr2 vs ddr3 effective mgz fake number 400vs800 {x2 100%}

real world improvement {X 12%}
—————————–

http://images.hardwarecanucks.com/image//skymtl/GPU/GTX-550/GTX-550-5.jpg

now take a look at this pic on the geforce 550ti topic

gddr5 qdr{lie} effective speed 4100mgz “real world ram speed 256mgz”

effective memory speed 98.5GB sec

real world bandwidth
{-85% fud bull park number}
98.5gb – 85% PR fud = 14.5GB sec

Then for a GTX 480 (GDDR5) with stock memory speed we have:

– Real memory speed: 231mgz
– Bus speed: 924MHz {wrong bus speed}
– Effective QDR memory speed: 3696MHz

*grins*
http://en.wikipedia.org/wiki/DDR_SDRAM

Sdr 100mgz = 100mgz internal speed~real world speed.

Ddr~sdr 100mgz internal real speed,100mgz bus speed,200mgz effective speed.

Ddr2-sdr 100mgz internal real speed,200mgz bus speed,400mgz effective speed.

Ddr3~sdr 100mgz internal real speed,400mgz bus speed,800mgz effective speed.

Ddr5~sdr 100mgz internal real speed,400mgz bus speed,1600mgz effective speed.

And gpu-x reads the external bus speed not the real world internal ram speed.

To answer the original posters question .

Gddr5 {notice it called ddr not qdr} 231mgz internal real world speed,924mgz bus speed,3696mgz effective total Public relations QDR bull shit speed number.

Btw theirs a new standard coming out soon called warp dive effective speed that means x4 more meaning 3696mgz effective qdr = 14786mgz WDqdr.
Sadly its about as fast as 72pin 10ns edo d-ram but whatever right ? people will buy in to it just wait and see.

And why do the powers that be do this ?
Because the marketing Public relations fools just love messing with your heads and lieing about proformance & numbers and we all know bigger numbers sell better …even if its all bull.

And just look at you all ..you all get it wrong ~ epic fail.

just look at sdr vs ddr in the first years, ddr1 is 30% faster {bull park number} then sdr not 2x in the real world, real benchmarks.
Now think about that and think about how fake the effective memory speed really is vs real world speed when it comes to gddr5 errr gqdr5 ram.
Use to be called ddr5 till someone found a way to blote the numbers
…enjoy
————
quote
Then for a GTX 480 (GDDR5) with stock memory speed we have:
– Real memory speed: 924MHz {wrong bus speed}
– Effective DDR memory speed: 1848MHz
– Effective QDR memory speed: 3696MHz

For a HD 5870 (also GDDR5) we have:
– Real memory speed: 1200MHz{wrong bus speed}
– Effective DDR memory speed: 2400MHz
– Effective QDR memory speed: 4800MHz

And for a GTX 275 (GDDR3) we have:
– Real memory speed: 567MHz{wrong bus speed}
– Effective DDR memory speed: 1134MHz

——————–

as well keep in mind the trick their using to pimp the numbers last i looked in to it is something along the lines of raid0 for hdd only use memory chips to jump bandwidth raid0 ram stile and the real internal speed of the ram is even lower then i stated if you were to put ram speed under a microscope.

I lost my keys. Could someone help me find them?

Thanks in advance!
Jow

single data rate = 1 person in a car driving from home to work

double data rate = 2 people in a car driving from home to work

quad data rate = 4 people in a car driving from home to work etc etc …

and thing of the highway they drive on as the bus that data flows over

– Core clock, on which memory chips storage transistors operates.
– I/O bus clock, on which memory chips buffers/GPU MCU buffers operates, two times more than core clocks.
– Data transfer rate, two times more than I/O bus clock, thanks for DDR technology.

The GDDR-5 VRAM is still DDR memory in terms of bus data transfers, not QDR. So, in case of GTX 480:
924 MHz – core clock
1848 MHz – I/O bus clock, this one is ‘real’, just as it was in previous generations.
3696 MHz — effective clock (data transfer rate).

the real memory speed is the clock speed that is sent to the memory chips via a clock generator of some sort

the effective speed is the internal clock speed running inside the memory chips, which is either double pumped (DDR) or quad pumped (QDR) over the ‘real’ clock

basically.. for every ‘tick’ of the clock, the memory can perform 2 (DDR) or 4 (QDR) operations

PS..these comments need to be editable!

seting the clocks via MSI-Afterburner while in this stuck low power state will NOT reset the clocks, but it does show the correct core/mem values (the P3 state for me running 2 monitors. running one monitor, ive had it get stuck in P8 and even P12)

the cause of it getting stuck.. for me it happens mainly when a compute app crashes (eg CUDA, OpenCL, DirectCompute, or even PhysX) ..but not always