Topic Title: Vishera HyperTransport bus and chipsets 970 and 990
Topic Summary: HyperTransport bus bottleneck?
Created On: 03/29/2014 01:10 PM
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 03/29/2014 01:10 PM
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Contiusa
Peon

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Hi guys, I am having some doubts regarding the HyperTransport bus, since there are motherboards with 5200 MT/s and 4800 MT/s. looking at Wikipedia, it says that since the 760G chipset the HT is 3.0 and 2600Mhz. Only the 990 chipset has HT 3.1 and 3200Mhz. Why's that?

So, what is the difference in between the 4800 MT/s and 5200MT/s?

 

What is the native HT bus of the FX Vishera? 4800 or 5200?



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 03/29/2014 09:58 PM
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Contiusa
Peon

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Looks like the motherboard maker needs to update the BIOS to accept 2600Mhz. Is that it? But this is a bottleneck? The CPU works sort of in a undervoltage?

Could someone explain for me the consequences of having a 2600Mhz CPU running in a 2400Mhz motherboard?

I would appreciate very much.



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-- W7 64 bits / 8GB / i7-3770K / Zalman 9900NT / Z77X-D3H / GTX 770 / Corsair GS 180GB / AX 750W --
-- W7 64 bits / 8GB / FX-6300 / Zalman 9900NT / GA 970A-D3P / HD 6870 / Corsair GS 128GB / HX 650W --

 03/29/2014 11:17 PM
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AMDforMe
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There is an infinitesimal difference in CPU performance with a change of HT frequency from 2400 to 2600 MHz. in my testing. In other words it means nothing in actual practice and is not a system bottleneck.



-------------------------

Building a reliable PC involves more than just assembling the parts. You need to be able to configure all of the BIOS settings appropriately. This can be quite involved and frustrating as it can require a lot of trial and error with stress testing. It is however often the only means to get a 100% reliable PC.

 03/30/2014 05:42 AM
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Contiusa
Peon

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Thanks for the answer, but even for overclock?



-------------------------

-- W7 64 bits / 8GB / i7-3770K / Zalman 9900NT / Z77X-D3H / GTX 770 / Corsair GS 180GB / AX 750W --
-- W7 64 bits / 8GB / FX-6300 / Zalman 9900NT / GA 970A-D3P / HD 6870 / Corsair GS 128GB / HX 650W --

 03/30/2014 09:20 PM
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-rascal-
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From what I've ready, the HyperTransport is the connection that links the CPU, CPU/NB, and memory together. The HT clock itself doesn't have an impact on performance.

The "rule" for the HyperTransport is it should never exceed the CPU/NB frequency. It should be the same or slightly lower.

The CPU/NB should be a minimum of double the frequency of your RAM.

Example:

  • DDR3 1866MHz --> 933
  • CPU/NB should be atleast 1866MHz (2000MHz is a standard multiple)
  • HT should be the same or slightly under

Some talk around the interwebs suggests 2600MHz for both the CPU/NB and HyperTransport is the ideal "sweet spot."

It seems that most 2nd generation FX processors can't obtain speeds beyond ~2600MHz - 2700MHz. It's possible, but uncommon. It may require a lot more voltage to go further.



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Edited: 03/30/2014 at 09:49 PM by -rascal-
 03/31/2014 07:09 AM
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Contiusa
Peon

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Originally posted by: -rascal-Some talk around the interwebs suggests 2600MHz for both the CPU/NB and HyperTransport is the ideal "sweet spot."

 

(Thanks) This is what is bothering me. The motherboard runs at 2400MHz and the FX-6300 is at the support list. Ok, it runs on the board, but wasn't they supposed to place a note saying that the board runs with the HT below the standard FX frequency? Will it affect a more aggressive overclock? Even a mild one?

It makes me feel cheated. In fact, the AMD motherboard scene is chaotic.

At the biggest Brazilian forum of computers people now are stopping to refer AMD CPUs because of that. A real compatible motherboard with the FX, chipset 990, is much pricier than a B75 or H81. In the end, an i5 with B75 or H81 is better and cheaper in Brazil. The cost benefit advantage they had is gone.

 

I was kind on in the fence about it, but with this HT issue I am also going to stop referring AMD CPUs. I mean, the D3P is brand new and it does not come with the standard frequency of the FX? Come on, AMD, Phenom was discontinued already.

Someone at the Gigabyte forum said that the 970 chipset might be a defective 990, hence why they don't come with 2600MHz, the same way the Intel-E is a defective Xeon.

I don't know what to think, but it does not make me happy. 

 



-------------------------

-- W7 64 bits / 8GB / i7-3770K / Zalman 9900NT / Z77X-D3H / GTX 770 / Corsair GS 180GB / AX 750W --
-- W7 64 bits / 8GB / FX-6300 / Zalman 9900NT / GA 970A-D3P / HD 6870 / Corsair GS 128GB / HX 650W --



Edited: 03/31/2014 at 07:19 AM by Contiusa
 04/01/2014 02:47 AM
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mrfla
Nerfed

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970 chipset 1 16x slot + 1 4x slot + 2 1x slots 22 pcie lanes, 990x 1 16x slot or 2 8x slots + 1 4x slot + 2 1x slots 22 pcie lanes. 990fx chipset 4 8x slots or 2 16x slots + 1 4x slot + 2 1x slots 38 pcie lanes. It's just different configuration nothing defective.

ps: the only defective chipsets are from intel,nvidia and Gigabyte got a lot of trouble because of them.

Proof http://www.tomshardware.com/news/nvidia-geforce-faulty-defect-gpu,7795.html

http://apcmag.com/nvidia_disaster_thousands_of_gpus_faulty.htm

http://www.novell.com/support/kb/doc.php?id=7014344

http://www.pcworld.com/article/219052/intel_knowingly_sells_faulty_sandybridge_chipsets.html

 



Edited: 04/01/2014 at 02:59 AM by mrfla
 04/01/2014 11:55 AM
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AMDforMe
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Originally posted by: Contiusa Thanks for the answer, but even for overclock?

Yes even for OC up to 4.8 GHz. IME.



-------------------------

Building a reliable PC involves more than just assembling the parts. You need to be able to configure all of the BIOS settings appropriately. This can be quite involved and frustrating as it can require a lot of trial and error with stress testing. It is however often the only means to get a 100% reliable PC.

 04/01/2014 01:17 PM
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Contiusa
Peon

Posts: 21
Joined: 12/19/2010

Originally posted by: AMDforMe
Originally posted by: Contiusa Thanks for the answer, but even for overclock?

 

 

Yes even for OC up to 4.8 GHz. IME.

 

 

Thanks mate,



-------------------------

-- W7 64 bits / 8GB / i7-3770K / Zalman 9900NT / Z77X-D3H / GTX 770 / Corsair GS 180GB / AX 750W --
-- W7 64 bits / 8GB / FX-6300 / Zalman 9900NT / GA 970A-D3P / HD 6870 / Corsair GS 128GB / HX 650W --

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