Subject: General Tech | August 24, 2018 - 12:29 PM | Jeremy Hellstrom
Tagged: Foreshadow, Intel, hyperthreading, L1TF, spectre, security, patch
In a move which should not come as a shock to anyone, Intel removed the wording which was revealed yesterday along with their Foreshadow patch for desktop CPUs prohibiting publishing comparative performance results. The reason Intel would rather you didn't post performance comparisons, pre and post patch, is that along with the microcode update HyperThreading needs to be disabled which has a noticeable effect on any multi-threaded application. Debian were of great help with this, refusing to deply the microcode patch with the gag order in place.
Red Hat foreshadowed what you will see with their results from the server chip patches, The Register notes as being "from a +30 per cent gain, to -50 per cent loss and beyond. Most HT testing, however, showed losses in the 0-30 per cent range."
"Intel has backtracked on the license for its latest microcode update that mitigates security vulnerabilities in its processors – after the previous wording outlawed public benchmarking of the chips."
Here is some more Tech News from around the web:
- IRC Turns 30 @ Slashdot
- Intel reportedly blocked an ARM-based version of the Surface Go @ The Inquirer
- Teardown chaps strip away magic from Magic Leap's nerd goggles @ The Register
- Now you can say you have Windows 95 as an app. Good luck explaining what for @ The Inquirer
- Hackers Stole Personal Data of 2 Million T-Mobile Customers @ Slashdot
- Reeven Twila RGB LED Light Strip @ Benchmark Reviews
Subject: Processors, Mobile | July 17, 2017 - 04:32 PM | Ken Addison
Tagged: ultrabook, quad core, Intel, i5-8520u, i5-7200u, hyperthreading, dell xps 13, acer swift 3, 15w
A few days ago, laptopmedia.com uncovered some listings for an unannounced revision to the Acer Swift 3 notebook.
In addition to the new Pascal-based NVIDIA MX150 GPU announced just before Computex, astute readers will also spot an unannounced CPU from Intel – the Core i5-8250U. While the model number itself doesn't tell us much other than it's a next generation CPU, the description in the Acer product listings notes it as a quad core CPU.
Following Intel's history with the U-series parts, the 8250U would traditionally be a 15W, dual core CPU with hyperthreading enabled, with the true quad core parts starting with the 35W TDP options
We've had an indication that a quad core U-series processor was coming in the second half of this year from Intel's performance claims presented at Computex this year, but we weren't quite sure what form it would take.
Doing some additional research, we can see several results from this processor in the Geekbench database from various notebook manufacturers – including devices we would expect to be refreshed like the Dell XPS 13 and ASUS Zenbook UX490.
From the Geekbench results of the XPS 13 with the i5-8520U compared to the current generation i5-7200U, we see a 54% increase in multi threaded CPU performance while only a 7% increase in single threaded performance. Keep in mind that these leaked benchmarks should be taken with a grain of salt, but we would be very impressed with these numbers in a shipping notebook.
Geekbench's processor profiler also reveals the i5-8250U to be a 4 core/8 thread processor, pointing to hyperthreading being enabled on the i5 processors as well as the i7's, like we currently see in the U-series.
Some people have been theorizing that this 8000 series processor is from the upcoming Coffee Lake release. However, based on some of the Intel roadmap leaks from late last year, I think that this is actually a Kaby Lake-R CPU. The leaked roadmap suggests that Kaby Lake-R will launch as the 8th generation processor family, to be released in the second half of 2017.
Either way, I am excited to finally see some push forward in the 15W CPU space, which I consider to be the sweet spot between battery life and performance for most users.
Stay tuned for more information on these new Intel processors and these new notebooks as we get out hands on them!
Subject: General Tech | October 29, 2012 - 12:00 PM | Tim Verry
Tagged: SoC, saltwell, Intel, hyperthreading, cedarview, atom
Intel has launched a new Atom-series processor called the Atom D2560. It is a 32nm processor based on the Saltwell microarchitecture, and it replaces the D2550 as the top chip in the lineup.
The D2560 has two x86 cores clocked at 2.0 GHz with support for Intel’s HyperThreading technology for four total threads. The Atom CPU supports SSE2, SSE3, and SSSE3 instructions. Further, it has 1MB of L2 cache. CPU cores are not the only thing Intel has packed into the Atom chip, however. A GPU clocked at 640 MHz and integrated memory controller are also included. The Atom IMC supports a single channel of DDR3 clocked at 1066MHz – with a maximum of 4GB with a single DIMM.
The D2560 has a 10W TDP rating and is available to OEMs for $47 per 1000 chips (tray pricing).
Learn more about Intel’s Atom-series processors at PC Perspective.
Subject: General Tech | April 26, 2012 - 11:48 AM | Jeremy Hellstrom
Tagged: hyperthreading, Intel, overclocking, fud
In the past there have been two arguments against using Intel's HyperThreading to create two threads per core. The first is specific to overclockers who found that previous generations of Pentium and Core architecture chips could remain stable when pushed to higher frequencies when they disabled HyperThreading. There is still a lot of testing to be done on Ivy Bridge overclocking before a definitive answer is found for this generation of chips, which may fall victim to power issues before HyperThreading becomes a major limiter.
The second issue is more serious and deals with the fact that in some cases enabling HyperThreading reduces the total performance of the chip on certain, usually single threaded, applications and by disabling it you will see performance improvements from your processor. SemiAccurate felt that this needed to be revisited in light of the release of Ivy Bridge and so took an i7-3770K through a battery of 7 tests once with HyperThreading enabled and once without, including a run through CineBench with multithreaded processing disabled. Drop by to see if there is any noticeable benefit to disabling HyperThreading on this generation of Intel processor.
Yes, that was 11 years ago
"We decided to explore the effects of Hyper-Threading on the performance of the Ivy Bridge based Core i7-3770K by running our CPU benchmarking suite on it twice. Once with Hyper-Threading enabled, and once with Hyper-Threading disabled. As such we set-up our results table to look for applications that perform better with Hyper-Threading disabled, rather than enabled."
Here is some more Tech News from around the web:
- Quantum cruncher beats today's computers by 10^80 @ The Register
- SSH firm aims to untangle crypto key hairball @ The Register
- TSMC profits fall by 8.4 per cent to $1.1bn @ The Inquirer
- Ivy Bridge overclocking performance is limited by current leakage @ The Inquirer