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AMD Phenom X4 840 and Phenom X4 975 Black Edition

MD with new quad-core

AMD Phenom X4 840 and Phenom X4 975 Black Edition

processors came out on fourth day of the new year 2011. These are, first, a new top model with the model name Phenom X4 Black Edition 975. We had already speculated that AMD would bring to the Phenom X4 Black Edition 970 probably no more new tetra-nuclear Phenom among the people and thus were not right – what pleased us exceptionally. Appears to be from the demand, despite the availability of six-core processors for more and even faster quad-core CPUs are still strong enough to once again set a shovel on it at the top. But the midfield is doing something in the four core qualities. AMD quad-core sales the previous three series. found at the top, often with free multipliers equipped models of the Phenom X4 900 series (“Deneb”, 6 MB L3 cache) and at the lower end of the tetra-nuclear product range, the Athlon X4 processors the 600 series (“Propus”, no L3 cache) are located. In between, AMD had been settled three quad-cores of the 800 series (“Deneb”, 4 MB L3 cache).

Phenom X4 975 Black Edition: Technical

What the new AMD Phenom X4 Black Edition processor is concerned, the technical details of the previous models are already well known. The number cruncher, code-named “Deneb” comes from one of the wafers that are exposed with the mask for the C3 stepping. This may to some readers might sound like “station”, but put simply it means but only that it is the most advanced production technology from AMD for these CPUs.

The clock of the Phenom X4 975 Black Edition quad-core is at 3.6 GHz to 100 MHz located higher than the previous flagship Phenom X4 Black Edition 970. Otherwise, the specifications regarding the cache sizes and configurations: 128 KB L1 Cache, 512 KB L2 cache per core on quad-cores required, in addition have the Phenom processors (as opposed to the Athlons) for a Level 3 (L3 ) cache, shared by all cores and through which they can directly communicate with each other. The maximum power (TDP) of the Phenom X4 975 Black Edition is the well for AMD’s respective flagship usual 125 watts.

Phenom X4 840: Technical

When AMD Phenom X4 840 we meet with the technical details then but at the unusual. Already in the introduction, we had the presence and size of the L3 cache as a key differentiator between processors of the Athlon 900 series and 800 series, or whether a CPU is now an “Athlon” or a “Phenom”. This logic was generally up to now and this article specifically to now, because with the Phenom X4 840 AMD breaks this pattern. The processors of the 800 series had all been “Deneb”, but with only four instead of six MB L3 cache – the Phenom X4 840 other hand, has no L3 cache. Although it is true, according to CPU-Z is a “Deneb” CPU, but this is a read error with relative safety. On the one hand gives AMD to put the Phenom X4 820 “Propus”, to others it is a Model 5 (“Deneb” Model 4). The revision BL-C3 promises a “Propus” (“Deneb” BR-C3) would be. Of course, we have tried to do a Level 3 cache – if still available – unlock that worked but not on three Boards. Nevertheless, it is conceivable that one or two AMD Phenom X4 840 actually endows the “Deneb” architecture. This practice was observed at AMD in the past, when large numbers had to be deployed rapidly, such as directly to market.

The model numbers correspond to AMD, as a rule the following scheme: +5 means more 100 MHz, +10 then 200 MHz. Thus, the Phenom X4 associates with the number 840 and its 3.2 GHz then also logical in the 800-series one, regards the timing of the cores. Technically, it corresponds, because “Propus”, but a previously available “Amd Athlon X4 650″, and not a Phenom II. Even if it one or the other whether these tricks regurgitates acid: From AMD’s perspective it makes sense. The omission of Level 3 cache saves production costs and the maximum heat still falls within the range of 95 watts – a “Deneb” with 6 MB L3 cache, and also 3.2 GHz (Phenom X4 955) allows itself as even 125 watts and the strong suspicion that a “Deneb” with only 4 MB L3 cache can no longer manage with 95 watts. Also sounds a “Phenom” with inexperienced buyers to more than just a “Athlon”.

Phenom X4 975 Black Edition: Overclocking

To overclock the AMD Phenom X4 975 II is designed and made extra (Note: warranty expired anyway). With the open multiplier (“Black Edition”) it is for newcomers to the matter very simply to elicit the wheels with the processor has a clock. However, advanced users are looking forward regularly when overclocking via open multipliers that demand elsewhere in the system is not hooked bars or other compromises. The kindly did for our test of AMD Phenom X4 available racks located at 975 Black Edition Overclocking is more prevalent. Good 4.2 GHz, we were able to coax the Phenom X4 975 stable with air cooling, without which – to exceed 1.5 V core voltage – we have defined. In the short trials with more than 1.5 volts, but without detailed stability tests, said the processor is also very well and showed potential above 600 MHz clock increase.

We have such a good overclocking with AMD Phenom X4 processors not had the luck and we seemed to be this time hold. Usually one of the four cores running at Phenom X4 processors stable only to about 4 GHz and is also moving to coarser with increases in core voltage hardly or even not more. In this case, the Phenom X4 975 Black Edition is much better for our model, but as always we want to point out that not every processor is capable of doing the operation outside the specifications of the tested parameters are stable.
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