Geekzone: technology news, blogs, forums
Guest
Welcome Guest.
You haven't logged in yet. If you don't have an account you can register now.


4433 posts

Uber Geek
+1 received by user: 834

Trusted
Lifetime subscriber

Topic # 62417 6-Jun-2010 19:19
Send private message

I have been reading on the net that hyperthreading can degrade performance. At the moment, I have disabled HT on my 930. I need it disabled so that I can overclock higher. Running the processor with HT on will increase my load temperature up to 10-15c more. I have also experienced occasional slight delay with games when the HT was on.

Quote from AMD BLOG with regards to hyperthreading:

Simultaneous Multithreading (SMT) is a method for squeezing two threads into one core. SMT was first researched by IBM in 1968 and introduced to x86 processors by Intel in 2002 under the name of HyperThreading. That sounds great, in concept. Carpooling is more efficient than giving everyone their own car, right?

Well, car pooling falls apart if the two employees live too far from each other and the office is close. If Bob lives 3 miles north of the office and Mary lives 2 miles south of the office, it really doesn’t make sense for them to carpool. In the bike and rider example above, think of SMT as a tandem bike. Yes it can move two riders, but not as quickly or efficiently as two separate bikes.

Can anyone here share their experience with regards to HT? Is HT really useless for servers?









Create new topic
467 posts

Ultimate Geek
+1 received by user: 100


  Reply # 339463 8-Jun-2010 17:45
Send private message

HT in it's first Intel go (pentium 4) was fairly useless - it had too many bottlenecks (parts of the CPU) that resulted in both threads being slowed down.

HT in Nehalem works much better, IF your using software that requires the use of 4 or more threads. I'm thinking video encoding, virtualisation or a particularly heavily used webserver.

As a case in point, I use my 920 pretty heavily for Folding@home, with HT on, I get a significantly higher performance output (using all 8 threads) than I do using just 4 with HT off. It's not double the performance, but it is more like 30% higher. That's at 3.8Ghz and currently holding ~60degC at 100%. I'm using a Noctua heatsink with push-pull fans. It's not that loud either.

Folding@home is actually a bit of a undersell for HT, because it tends to hit the HT bottlenecks harder than it does the rest of the CPU, so in some cases you can actually get well above a 30% boost.

Therefore, if you use between 4 and 8 threads on a frequent basis then you'd need an OC of 30% over and above your HT stable rate.

k1wi

Create new topic

Twitter »

Follow us to receive Twitter updates when new discussions are posted in our forums:



Follow us to receive Twitter updates when news items and blogs are posted in our frontpage:



Follow us to receive Twitter updates when tech item prices are listed in our price comparison site:





News »

Intel introduces new NUC kits and NUC mini PCs
Posted 16-Aug-2018 11:03


The Warehouse leaps into the AI future with Google
Posted 15-Aug-2018 17:56


Targus set sights on enterprise and consumer growth in New Zealand
Posted 13-Aug-2018 13:47


Huawei to distribute nova 3i in New Zealand
Posted 9-Aug-2018 16:23


Home robot Vector to be available in New Zealand stores
Posted 9-Aug-2018 14:47


Panasonic announces new 2018 OLED TV line up
Posted 7-Aug-2018 16:38


Kordia completes first live 4K TV broadcast
Posted 1-Aug-2018 13:00


Schools get safer and smarter internet with Managed Network Upgrade
Posted 30-Jul-2018 20:01


DNC wants a safer .nz in the coming year
Posted 26-Jul-2018 16:08


Auldhouse becomes an AWS Authorised Training Delivery Partner in New Zealand
Posted 26-Jul-2018 15:55


Rakuten Kobo launches Kobo Clara HD entry level reader
Posted 26-Jul-2018 15:44


Kiwi team reaches semi-finals at the Microsoft Imagine Cup
Posted 26-Jul-2018 15:38


KidsCan App to Help Kiwi Children in Need
Posted 26-Jul-2018 15:32


FUJIFILM announces new high-performance lenses
Posted 24-Jul-2018 14:57


New FUJIFILM XF10 introduces square mode for Instagram sharing
Posted 24-Jul-2018 14:44



Geekzone Live »

Try automatic live updates from Geekzone directly in your browser, without refreshing the page, with Geekzone Live now.



Are you subscribed to our RSS feed? You can download the latest headlines and summaries from our stories directly to your computer or smartphone by using a feed reader.

Alternatively, you can receive a daily email with Geekzone updates.