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FAQ: How far you can OC your HyperTransport link

post #1 of 11
Thread Starter 
Hi, Over the past months I saw loads and loads of threads of new and old members asking how far they can push the HT link speed of their AMD system.

Well...After overclocking my new AMD cpu and some questions about overclocking the HT link speeds, I decided to take a look at this topic and make a thread showing people what they can achieve on their system.


NOTE:
I will not be taken responsible for any problems you come across but I found this to be very stable with my current AM2 setup, however I will do my best to help people out


Initially I always stayed under 1000mhz


After that I just raised my HT multi to 4 X with my fsb at 316mhz


And so decided to push it and set the HT multi to 5 X with my fsb still at 316mhz



Some benchmarks:

under 1000mhz




HyperTransport at 1576mhz




Now running with the 5 x Multi I think that the HT link can be pushed further, but That will be tested in the near future

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post #2 of 11
Bench it - see what performance benefits it offers
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post #3 of 11
Nice FAQ.
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post #4 of 11
Any real performance increase? Benchmarks?
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post #5 of 11
I remember a while back there was an HT benchmark test done. between 1x and 5x there was a 1-2fps diffrence in all the gaming benchmarks haha.
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post #6 of 11
Thread Starter 
At highest possible settings you get about 2fps difference in games and cpu benchmarks looks almost the same

Not really something that would benefit you a lot
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post #7 of 11
Quote:
Originally Posted by shifty22123 View Post
At highest possible settings you get about 2fps difference in games and cpu benchmarks looks almost the same

Not really something that would benefit you a lot
If you max out a game it will obviously be GPU bottlenecked.

How about a SuperPi so we can see how it would benefit CPU power
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post #8 of 11
I decided to try a little experiment. My system is in my sig...

I used super pi calculating pi to 8 million digits. With my HT link at 1120 MHz (280x4) it took 5:49. With my HT link at 840 (280x3) I got 5:51. To me, that difference is negligible. I'm sure this is not the end all of HT benchmarks but it says a lot when a 25% drop in speed yields an insignificant difference. (Rep points!!!!!)
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post #9 of 11
HT generally doesnt overclock very well past 1ghz. It will go higher, but not by alot stable. Im only running mine at like 1.1ghz right now.
    
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post #10 of 11
Quote:
Originally Posted by {LSK} Otacon View Post
HT generally doesnt overclock very well past 1ghz. It will go higher, but not by alot stable. Im only running mine at like 1.1ghz right now.

In relation to 939 systems you are quite correct. However with an AM2 rig many find better stability between 1100-1400MHZ.
    
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