Thuban – no you don’t have a speech impediment
While the Phenom II architecture might not be the foil against the Nehalem family of chips from Intel, it does not mean that AMD has been standing still and waiting for Bulldozer to deliver them from financial doom. Instead, AMD has actively improved these chips, and their latest member of the Phenom II family brings 6 cores to the fight. The Phenom II X6 1090T Black Edition is an unlocked new design based on the Thuban core, and it aims to bring fast and affordable 6 core performance to the marketplace.Testing by Ryan Shrout, written by Josh Walrath.
The original Phenom II redesign (Deneb) on 45 nm gave AMD the product which could match Intel in terms of overall performance with the older Core 2 Quad series of parts. Unfortunately for AMD, the Intel i7 series proved to be far too powerful of an opponent to overtake. The Phenom II has had a good run though, and it has kept AMD as a contender in the CPU field. Now that Intel has fleshed out the rest of its Nehalem family and is slowly phasing out the Core 2 products, AMD was left with a stagnating product landscape.
The Phenom II X4 series has topped out at 3.4 GHz and looks to potentially go no further. The Athlon II series of parts (X2, X3, and X4) have proven to be affordable and popular products that have carved out a solid marketplace in the budget sector. AMD certainly needed something to keep the company relevant in the face of Intel’s ever expanding family of fast Nehalem based processors. AMD also needed something to compete with Intel’s recently released i7-980 Extreme, which is a 3.33 GHz 6 core processor that has ruled the performance roost. But if there were one downside to the i7 980, it is the price. Originally released at $999, most retailers have raised that price fairly significantly.
On the server side AMD has kept pace with Intel, and in fact had released the first 6 core product in the Summer of 2009. The original “Istanbul” core powered the latest Operton processors with speeds up to 2.8 GHz for limited edition parts. The majority of these products were clocked below 2.6 GHz, but they proved to be popular for their low overall TDP and processor density. AMD knew it had the basic design to compete with Intel on the high performance desktop, but more work had to be done to get it ready for that platform.
The Thuban core and AMD’s 6-core gamble
From Istanbul to Thuban. Even though these two places are light years away from each other, the design that AMD has produced for both of these chips is nearly identical. Internally they are the same, but of course externally they do have some differences. Thuban will reside in a 938 pin chip package with one HT 3.0 connection while Istanbul is in Socket F form with 1207 LGA pads.
AMD focused on power efficiency as well as potential clockspeed targets close to that of the previous Deneb/Shanghai processors. On the desktop Deneb was able to hit 3.4 GHz with a TDP of 140 watts, but that later shrunk to 125 watts with the Revision C3 parts. With Thuban being about 25% bigger in terms of die size and transistor count, it was initially thought that it would be unlikely that AMD would be able to make a 3 GHz+ part and reach the same TDPs as Deneb.
AMD had two advantages over Deneb and its TDP/clockspeed combination. Time and process enhancements. AMD was able to take the initial Shanghai/Deneb design, and really optimize the architecture to retain its clockspeed but also improve power properties. AMD implemented more aggressive power saving routines and work out some of the troublesome spots on the original design.
In the end we are faced with a product with a 25% larger die size, but is able to clock to the same speeds as the previous Deneb processors, all the while retaining a 125 watt TDP rating. The 3.2 GHz Phenom II X6 is officially named the Phenom II X6 1090T. At first glance one would think that this chip has little to offer people who will not utilize all six of those cores as compared to the much cheaper Phenom II X4 955. This is not correct.
AMD let this little number slip earlier this month, and this can be viewed as a “poor man’s Turbo Boost”. Intel released Turbo Boost with their i7 processors, and it basically overclocks individual cores to higher clockspeeds, depending on the TDP properties of the chip as a whole. For example one core is clocked an extra 266 MHz while the rest of the cores go into a low power mode, or are stopped altogether. Two cores can be clocked up 133 MHz a piece if the processor detects if those cores are the ones being highly utilized. Intel’s Turbo Boost is a very granular solution which really accentuates the performance of the i7 across a large number of workloads.
AMD is constantly updating its OverDrive software suite, which makes overclocking Black Edition processors a breeze. It supports the new 1090T processor, and it really is the only way to adequately check if Turbo Core works. This also controls the North Bridge speed of the Processor, as well as memory and HyperTransport speed.
Motherboards need to support AOD (AMD OverDrive) to get it to work. Certain memory manufacturers have also released “Black Edition Profiles” that maximize performance of their DIMMS when used with AOD and Phenom II processors.