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HyperTransport 3.0 what exactly does it help do?

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post #1 of 17 (permalink) Old 04-30-2012, 01:30 AM - Thread Starter
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Ok so i was reading and trying to understand hypertransport and how it works and i a cross this
article here : http://www.hardwaresecrets.com/article/Everything-You-Need-to-Know-About-the-HyperTransport-Bus/19/4

so as i understand it 8 megabits = 1 megabyte

1,800 Mhz = 3,600 MT/S = 7,200 MB/S (Megabits)
2,000 Mhz = 4,000 MT/S = 8,000 MB/S
2,400 Mhz = 4,800 MT/S = 9,600 MB/S

and finally the ratio I accually care about, so if
2,600 Mhz = 5,200 MegaTransfers per Second = 10,400 Megabits per Second
If 8 Megabits = 1 Megabytes then that means that 10,400 Megabits equall 1.3 Megabytes right?
If thats true then wouldnt that mean that 1.3 Megabytes X 2 = 2.6 Megabytes/s aka 2,600 Mhz
or 2,600 Mhz X 2 = 5,200 MegaTransfers

So now if im runing a ssd from the pci-e lane and a gpu, my x64 os is on the ssd and im using my ssd to process both small and large video files via my gpu and also after converting my videos into iso's i burn 4 copys of them on to dvds at the same time via nero 11 so all 4 burners connected via my onboard sata II ports will be reading the same data simultaneously and writing on to the dvds, after the data has been written
on the dvds i move the iso image to my 1Tb hhd connected via sata II port note that these video files are anyware from 2.5 GB to 4.5 GB becouse there high quality movies my question is do i benefit from utilizing a hypertransport of 2,600 Mhz ? thinking.gif please share your 2cents.gif

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post #2 of 17 (permalink) Old 04-30-2012, 12:02 PM
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Math time!

SSD based on sig: ~500MB/s
Fast HDD speed: ~150MB/s
Fast DVD speed: ~50MB/s
Fast DVD speed: ~50MB/s
Fast DVD speed: ~50MB/s
Fast DVD speed: ~50MB/s

Total: ~850MB/s
(GPU not calculated; dependent on SSD)

The only time a HT link should even be close to flooded is moving large things from RAM to the GPU. You're fine. Although it is generally suggested to run the HT link as close to stock as possible on Phenom IIs.


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post #3 of 17 (permalink) Old 04-30-2012, 12:11 PM
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Quote:
Originally Posted by Kalistoval View Post

Ok so i was reading and trying to understand hypertransport and how it works and i a cross this
article here : http://www.hardwaresecrets.com/article/Everything-You-Need-to-Know-About-the-HyperTransport-Bus/19/4
so as i understand it 8 megabits = 1 megabyte
1,800 Mhz = 3,600 MT/S = 7,200 MB/S (Megabits)
2,000 Mhz = 4,000 MT/S = 8,000 MB/S
2,400 Mhz = 4,800 MT/S = 9,600 MB/S
and finally the ratio I accually care about, so if
2,600 Mhz = 5,200 MegaTransfers per Second = 10,400 Megabits per Second
If 8 Megabits = 1 Megabytes then that means that 10,400 Megabits equall 1.3 Megabytes right?
If thats true then wouldnt that mean that 1.3 Megabytes X 2 = 2.6 Megabytes/s aka 2,600 Mhz
or 2,600 Mhz X 2 = 5,200 MegaTransfers
So now if im runing a ssd from the pci-e lane and a gpu, my x64 os is on the ssd and im using my ssd to process both small and large video files via my gpu and also after converting my videos into iso's i burn 4 copys of them on to dvds at the same time via nero 11 so all 4 burners connected via my onboard sata II ports will be reading the same data simultaneously and writing on to the dvds, after the data has been written
on the dvds i move the iso image to my 1Tb hhd connected via sata II port note that these video files are anyware from 2.5 GB to 4.5 GB becouse there high quality movies my question is do i benefit from utilizing a hypertransport of 2,600 Mhz ? thinking.gif please share your 2cents.gif
Quote:
Originally Posted by KyadCK View Post

Math time!
SSD based on sig: ~500MB/s
Fast HDD speed: ~150MB/s
Fast DVD speed: ~50MB/s
Fast DVD speed: ~50MB/s
Fast DVD speed: ~50MB/s
Fast DVD speed: ~50MB/s
Total: ~850MB/s
(GPU not calculated; dependent on SSD)
The only time a HT link should even be close to flooded is moving large things from RAM to the GPU. You're fine. Although it is generally suggested to run the HT link as close to stock as possible on Phenom IIs.

Math? wth.gif

From personal trial and error, increased HTT speeds only help once you max out the chipset bandwith. A speed of 2000MHz will give you around 16Gbps internally. You would have to run your RAM at a greater speed than this to see an increase in performance. I use Sandra http://downloads.guru3d.com/downloadget.php?id=2056&file=7&evp=961bab4bcae4ac632dacb807b976bc0b to test.
example #1 HTT at 2160MHz
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post #4 of 17 (permalink) Old 04-30-2012, 12:22 PM
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Quote:
Originally Posted by Redwoodz View Post

Math? wth.gif
From personal trial and error, increased HTT speeds only help once you max out the chipset bandwith. A speed of 2000MHz will give you around 16Gbps internally. You would have to run your RAM at a greater speed than this to see an increase in performance. I use Sandra http://downloads.guru3d.com/downloadget.php?id=2056&file=7&evp=961bab4bcae4ac632dacb807b976bc0b to test.
example #1 HTT at 2160MHz
480

And the math shows he isn't even close to maxing it, yup. biggrin.gif

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post #5 of 17 (permalink) Old 04-30-2012, 01:05 PM
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Quote:
Originally Posted by KyadCK View Post

And the math shows he isn't even close to maxing it, yup. biggrin.gif

480

480

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post #6 of 17 (permalink) Old 04-30-2012, 01:50 PM
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That's nice, but what increased that speed was your FSB going up (and thus forcing your RAM to be faster). RAM isn't on the HTT.
422

EDIT: Foot, meet mouth.

Anyway, I did say AMD said to keep the HTT as close to stock as possible. A better test however would be to leave everything stock and nudge the HTT multi around a bit.


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post #7 of 17 (permalink) Old 04-30-2012, 01:53 PM
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To note, HTT = bus speed, reference clock, base clock. It is not the HT Link speed. Just for reference.

@OP

I believe the differences in HT versions (1.0, 2.0, 3.0 etc) are variations of the same principle in transporting data over that i/o interface, but each version has theoretical limits and transfer speeds. Calculating them is tricky at best partially because the reported speed isn't how the speed is measured.

So HT 3.0 aims to implement enough bandwidth for ever-increasing bandwidth requirements of GPU and other high end PCI-E devices (SSD, controllers, etc).

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post #8 of 17 (permalink) Old 04-30-2012, 02:03 PM
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Quote:
Originally Posted by GanjaSMK View Post

To note, HTT = bus speed, reference clock, base clock. It is not the HT Link speed. Just for reference.

Ah damn, I had it right the first time. tongue.gif
Quote:
So HT 3.0 aims to implement enough bandwidth for ever-increasing bandwidth requirements of GPU and other high end PCI-E devices (SSD, controllers, etc).

Hopefully PCI-e will get bumped up to the CPU directly instead of relying on the HT. That'd be nice. Not that HT isn't a seriously wide pipe, but it is one more step that has to be taken between the CPU and GPU.

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post #9 of 17 (permalink) Old 04-30-2012, 02:10 PM
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Hopefully PCI-e will get bumped up to the CPU directly instead of relying on the HT. That'd be nice. Not that HT isn't a seriously wide pipe, but it is one more step that has to be taken between the CPU and GPU.

I'm pretty sure too there are a couple other things that were implemented with HT 3.0 that also relies on the chipset, but I don't know specifically what. Been a while since I read anything about the differences. redface.gif

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post #10 of 17 (permalink) Old 04-30-2012, 03:10 PM - Thread Starter
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so what exactly does this mean?

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