Tuesday, May 5th 2009

GT300 to Boast Around 256 GB/s Memory Bandwidth

Recently, early-information on NVIDIA's next-generation GT300 graphics processor surfaced, that suggested it to pack 512 shader processors, and an enhanced processing model. A fresh report from Hardware-Infos sheds some light on its memory interface, revealing it to be stronger than that of any production GPU. According to a piece of information that has been doing ping-pong between Hardware-Infos and Bright Side of News, GT300 might feature a 512-bit wide GDDR5 memory interface.

The memory interface in conjunction with the use of the lowest latency GDDR5 memory available, at a theoretical 1000 MHz (2000 MHz DDR) would churn out 256 GB/s of bandwidth, the highest for a GPU so far. Although Hardware-Infos puts the lowest-latency figure at 0.5 ns, the math wouldn't work out. At 0.5 ns, memory with actual clock rate of 1000 MHz would churn out 512 GB/s, so a slight inaccuracy there. Qimonda's IDGV1G-05A1F1C-40X leads production today with its "40X" rating. With these chips across a 512-bit interface, the 256 GB/s bandwidth equation is satisfied. The clock speeds of the memory isn't known just as yet, the above is just an example that uses the commonly available high-performance GDDR5 memory chip. The new GPU, at least from these little information leaks, is shaping up to be another silicon-monstrosity by NVIDIA in the making.Source: Hardware-Infos
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106 Comments on GT300 to Boast Around 256 GB/s Memory Bandwidth

#1
Mussels
Moderprator
sounds like a new 8800GTX
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#2
h3llb3nd4
Yeah lets just hope that it doesn't idle at 55 degrees:p
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#3

This in conjunction with the use of the lowest latency GDDR5 memory available (0.5 ns), at a theoretical 1000 MHz (2000 MHz DDR)
If its GDDR5 shouldn't it be 4000MHz DDR ?
#4
btarunr
Editor & Senior Moderator
by: wolf2009
If its GDDR5 shouldn't it be 4000MHz DDR ?
No, the data is pushed only on two parts of a clock cycle, so it's DDR, and GDDR5. The amount of data pushed makes the difference here, and is twice that of what GDDR3 pushes. You can put it as "effectively 4.00 GHz", but not "4.00 GHz DDR". It's still 2.00 GHz when its actual clock-speed is 1 GHz.
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#5
cyriene
I have a feeling this monster card will come with a monster price!
Can't wait to see what AMD's response is to this beast.
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#6
DrPepper
The Doctor is in the house
by: btarunr
No, the data is pushed only on two parts of a clock cycle, so it's DDR, and GDDR5. The amount of data pushed makes the difference here, and is twice that of what GDDR3 pushes.
GDDR5 is actually QDR.

At least from what I've been told.

Edit: Wasn't quite right but according to wikipedia "GDDR5 is the successor to GDDR4 and unlike its predecessors has two parallel DQ links which provide doubled I/O throughput when compared to GDDR4"
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#7
sapetto
And it will be 30cm long.... :D:laugh:
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#8
PCpraiser100
Again another PCI-E graphics monster from Nvidia intending to torture our PSUs.
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#9

by: btarunr
No, the data is pushed only on two parts of a clock cycle, so it's DDR, and GDDR5. The amount of data pushed makes the difference here, and is twice that of what GDDR3 pushes. You can put it as "effectively 4.00 GHz", but not "4.00 GHz DDR". It's still 2.00 GHz when its actual clock-speed is 1 GHz.
i meant to say 4GHz effective, since we are used to saying that in case of GDDR5 on ati cards.

So shouldn't it be easier to put 4GHz effective in the article as people are used to saying that, rather than getting somebody confused.

Anyway, I didn't get you point that
It's still 2.00 GHz when its actual clock-speed is 1 GHz
. So does GDDR5 push 4GHz or 2GHz ?
#10
Animalpak
takes performance crown for sure.
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#11
DrPepper
The Doctor is in the house
by: Animalpak
takes performance crown for sure.
From the current generation yes but from the next we will never know.
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#12
btarunr
Editor & Senior Moderator
by: DrPepper
GDDR5 is actually QDR.

At least from what I've been told.
Not that I didn't know that. You need to understand how it works to know why they don't call it QDR, even when the bandwidth is four times that of DRAM at a given clock-speed.
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#13
DrPepper
The Doctor is in the house
by: btarunr
Not that I didn't know that. You need to understand how it works to know why they don't call it QDR, even when the bandwidth is four times that of DRAM at a given clock-speed.
I just looked it up there. Its not that it sends information 4 times in 1 clock but its that it has two more paths. I think.
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#14
mlee49
Can someone help explain how memory bandwidth relates to overall preformance? If the new GTX 300 series has 256 GB/s and the 295 already has 223.8 GB/s does the gpu use the clocks better? Does it use the memory better?

So does higher mem bandwidth = better memory overclock?
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#15
ZoneDymo
Its already ridiculous as it is.
People have freaking 1200 watt psu's.
That is not cool, this thing better now use more power than currnet cards.
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#16
DrPepper
The Doctor is in the house
by: mlee49
Can someone help explain how memory bandwidth relates to overall preformance? If the new GTX 300 series has 256 GB/s and the 295 already has 223.8 GB/s does the gpu use the clocks better? Does it use the memory better?

So does higher mem bandwidth = better memory overclock?
Bandwidth is the result of the memory clock speed and the bus size. Which means if the memory runs at a higher clock speed and the bus width is bigger then more bandwidth.
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#17
mlee49
So the overall higher bandwidth will mean the card will run an overclock better, right?
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#18
DrPepper
The Doctor is in the house
by: mlee49
So the overall higher bandwidth will mean the card will run an overclock better, right?
No. That is dependant on the memory modules on the card.
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#19
mlee49
So I'm ovbiously not fully understanding this so lets do a comparision:

Take for example the 275 line up from Evga, the standard edition vs the FTW edition. Both are same gpu's, both are same memory modules, but the FTW edition is clocked faster and has a slightly higher memory bandwidth. Wouldn't the higher bandwidth mean the FTW edition preforms better than the regular edition overclocked to the same clock settings? I'm trying to clarify to see if the extra $ for a higher memory bandwidth will pay off.
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#20
mdm-adph
Wonder if it'll be dual-core...
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#21
DrPepper
The Doctor is in the house
by: mlee49
So I'm ovbiously not fully understanding this so lets do a comparision:

Take for example the 275 line up from Evga, the standard edition vs the FTW edition. Both are same gpu's, both are same memory modules, but the FTW edition is clocked faster and has a slightly higher memory bandwidth. Wouldn't the higher bandwidth mean the FTW edition preforms better than the regular edition overclocked to the same clock settings? I'm trying to clarify to see if the extra $ for a higher memory bandwidth will pay off.
Chances are the FTW version and stock can both achieve the same clock speed because the modules would be rated to the same speed. If the FTW version and the stock version are at the same speed performance will be identical. Higher bandwidth will increase frames per second and help with higher resolutions
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#22
random
Woot! Next gen nvidia cards here we come! Might leave ATI/AMD speechless for a while unless they release their next gen cards along the same quarter which I hope will happen else we aussies will be seeing video cards at the 1000+ AUD mark again :roll:
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#23
ShadowFold
So did this leak or did they announce it? I don't think it's smart to announce what you're coming out with like this. AMD is watching.. They're probably already trying to get something to trump it. It's gonna be hard, but I'm sure they'll keep up. I just hope we don't see another HD 2900XT vs 8800GTX :laugh: Not saying the 2900XT was bad. I owned two of them myself. The 8800GTX was just so much better..
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#24
mlee49
by: DrPepper
Chances are the FTW version and stock can both achieve the same clock speed because the modules would be rated to the same speed. If the FTW version and the stock version are at the same speed performance will be identical. Higher bandwidth will increase frames per second and help with higher resolutions
Thanks DP :toast: Just trying to learn more about gfx cards and overclocking. It's not all about the clock speeds :cool:
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#25
DrPepper
The Doctor is in the house
by: mlee49
Thanks DP :toast: Just trying to learn more about gfx cards and overclocking. It's not all about the clock speeds :cool:
No problem. I forgot to mention latency in the memory modules come into play just like regular RAM. It's rated in ns and the lower the better. If you have a FTW edition that has better rated modules than a stock version then at the same speed they will be slightly different but most companies use the same memory modules for FTW editions and stock.
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