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General Processing Units and Technology
Do not let Power Management mess up your performance analysis!

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Carsten

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Published on 06-09-11 18:41 Number of Views: 484

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Article

Architecture

Modern processors, be they of CPU, GPU, APU or SoC flavour, employ very sophisticated power management techniques in order to better leverage the full potential of their respective fucntional units in combination with the applied thermal solution. What sounds quite basic is indeed quite a multi-dimensional topic and can easily mess with any performance analysis that is not taking into account the specifics in each processor. In this article I am giving an outline what contributes to the power management in modern processors.

A while ago - in It-time quite an eternity - processors had a certain clock speed which they maintained during all operations. They had a fixed TDP that defined the necessary cooling solutions' capabilities to the fraction of a watt. Of course, power was quite low compared to more recent devices in the desktop space. Mobile devices, being much more dependant on a low power consumption, employed simple techniques like a reduced state for clock speed and core voltage as early as the turn of the millenium. With more recent devices, power has become a much more important issue in more than one respect - even in the desktop space. ...

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Stay in the loop - GPU-Tech webwatch

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Carsten

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Published on 08-08-11 18:19 Number of Views: 1163

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• GPU Technology Conference 2012 begins - new Tesla K10 imminent
• Catalyst 12.4 Hotfix for Diablo 3 (HD2k, 3k4, 3k6 and 4k5)
• Diablo 3: No Catalyst 12.4 users allowed
• Nvidia releases Geforce GTX 690 - still microstutters
• AMD moves HD2000, 3000 and 4000 to quarterly driver updates
• Nvidia will talk about 7.000.000.000 transistor GPU at GTC 2012
• AMD OpenCL 1.2 Beta drivers ready for download
• Windows 8 Consumer preview available
• Wikipedia's Picture of the Day: Nurbs :-)

Obviously, this being a one-man-show, I cannot cover everything worth knowing that happens on and off the web. So I keep to a wise line from a probably wise person: „If you can't do your own story, link to it!” And this is what this regularly updated post will be about: Links to interesting articles, downloads, ressources, background and maybe even reviews and videos throughout the web: No bull, no bias, just the facts. ...

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AMD's got an ace up it's sleeve: Tahiti-ASIC probably has 36 CUs/2304 Shaders [Update: Not?]
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Carsten

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Published on 30-12-11 15:16 Number of Views: 1636
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Article

Architecture
AMD's recent launch of it's latest and greatest, the Radeon HD 7970, despite taking over the single-gpu performance crown, left quite a few people wondering. Wondering, if that was all; wondering, if there might be performance left on the table somewhere in the drivers; wondering, if the focus on compute did cost to much gaming performance. This was especially true when comparing the number of transistors to it's predecessor Cayman, which already boasted an impressive 2.64 billion little transistors. Tahiti's number was far more impressive though and with 4312 million transistors broke the 4 billion mark. Now, a possible explanation has surfaced in a photograph of what looks like a product catalogue from AMD partner Sapphire.
Update Jan 3rd, 2012 21:45: According to a story over at Brightsidenofnews.com, Chris Hook, currently „Head of WW Social Media and Ecosystem Communications” at AMD flat out denied, saying

...

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Graphics Core Next in Radeon HD 7970: A look at instruction issue rates in graphics contexts
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Carsten

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Published on 28-12-11 08:00 Number of Views: 509
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Article

Architecture
AMDs recently launched Radeon HD 7970 brought the first installment of „Graphics Core Next“ in the shape of a 4.312 billion transistor processor code named Tahiti. With Graphics Core Next (or GCN for short) AMD has taken a radically different approach to compute than with their former Very Long Instruction Word (VLIW) based micro-architectures. The emphasize not only in the last sentence is on compute because that's the area were the new architecture is set to flex it's ALU muscles first and foremost - for graphics only, AMD remained adamant, VLIW was (and is) a very efficient way of cramping highly potent circuits on a small amount of die space.

Gaming performance of the Radeon HD 7970 is somewhere between 25 tp 50 percent up from HD 6970 and somewhere from 10 to 30 percent above the former single GPU champ Geforce GTX 580 - no matter if 1,5 or 3 GiB. With that settled, let's take a look at Tahiti in it's XT version and dig a little deeper.
...

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AMD APP SDK 2.6 available for download - first glimpse of OpenCL 1.2 [Update]
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Carsten

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Published on 12-12-11 20:44 Number of Views: 1161
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Just a quickie this time. AMDs developer page has been updated as of now with the checksums of AMD APP SDK 2.6. The files linked there as of this writing are still 2.5, but if you alter the link to point to 2.6 instead of the linked SDK, you get the brand new APP SDK 2.6. But please try and visit their site first - they should have updated it any minute now. In a blog-entry from a couple of days ago, AMDs Mark Ireton apart from revealing today's launch date for the 2.6 SDK, already outlined some of the changes, AMD APP 2.6 will bring. Most notably, Open CL 1.2 will be on the support list for 2012 where AMD is commited to fully support the most important open GPU-Compute standard on both CPUs and GPUs. The APP SDK 2.6 is to include previews on some of OpenCL 1.2's core features according to AMD.
...

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AMD Radeon Driver Catalyst 11.11 WHQL and CAP1 tweaked for Battlefield 3 out, Skyrim-CAP & performance driver to come ASAP
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Carsten

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Published on 15-11-11 16:33 Number of Views: 1635
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After last month's very late release of Catalyst 11.10, the November issue of AMDs Radeon graphics drivers, Catalyst 11.11 WHQL is available for download already. AMD also issued the first Catalyst Application Profile, short CAP, for 11.11 release, which adds tweaks for the Battlefield 3 profile in Crossfire multi-GPU configurations, improves Crossfire performance for Global Ops: Commando Lybia and disables Crossfire - probably there have been issues - for Driver San Francisco.
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Intel unveils more details about Cedar Trail processors Atom D2x00 & N2x00 [Update: Datasheets complete]
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Carsten

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Published on 03-10-11 09:10 Number of Views: 1109
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Article

Architecture
With the official launch of Cedar Trail's desktop variants D2700 and D2500 just a few days ago, more and more details about the (ultra) mobile processor based on Intels Atom mircoarchitecture are starting to appear.

While you can read about the chip's 1.86 to 2.13 GHz frequency, their 42 - 52 Dollar price, their 32nm manufacturing, their NM10 chipset and similar basics elsewhere, I am going to concentrate on some peculiar facts that either just surfaced or were confirmed through Intels data sheet for Intel's D2000 and N2000 series of Atom processors: The missing DirectX 10.1 support, (almost) no power management for the IGP or the limited video decoding support.
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Catalyst 11.10 WHQL - First official Battlefield 3 driver for Radeon graphics cards, 11.9 CAP4 still recommended (Updated)
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Published on 31-10-11 17:32 Number of Views: 3476
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Catalyst 11.10 WHQL is finally available and it is the first official driver release for Radeon graphics cards after the final version of this years' most anticipated game, Battlefield 3, came out. Strangely enough, Battlefield 3 is nowhere mentioned throughout the release notes, which you can review for yourself here or use the attached version below (Updated, see below!). AMDs Andrew Dodd, going by the name of CatalystCreator in the microblogging service twitter, recommends to use Catalyst 11.9 CAP4 after installing Catalyst 11.10 WHQL. Catalyst Application Profiles or CAP for short, are linked below as well. He goes on to say, that Catalyst 11.10 WHQL contains the same fixes as are present in the earlier Catalyst 11.10 Preview v3 drivers.
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