If the X4 645 could be purchased for less than $102, the X4 840 would receive an automatic “fail” from me, since it would be nothing more than sneaky marketing. Weaknesses Mine was an engineering sample, which tend to be slightly weaker than later batches. The L3 cache is the one glaring omission from this CPU’s specifications. This simple integer benchmark focuses on the branch prediction capabilities and the misprediction penalties of the CPU. It looks like the lack of L3 cache might play a role here as well as the X4 840 overclocked to 3.8 GHz is slightly slower than the stock X4 965. This could account for such a performance difference between the i5 and X4 840. Basically, this is an Athlon II X4 645 plus 100 MHz. 5,898. Reasons to consider the AMD Phenom II X4 840 : Report a correction: CPUBoss is not aware of any important advantages of the Phenom II X4 840 vs the FX 4100. The i5 655k was able to calculate 1 million digits of in half the time that it took the X4 840. I did not spend hours upon hours tweaking my setup, but this is a pretty good indication of where you can get this chip with a decent amount of effort. It is interesting to note that for more than double the price, the X6 1100T only yields a 63% performance increase over the X4 840. Above is my attempt at a maximum overclock. This benchmark performs different common tasks used during digital photo processing…This benchmark stresses the integer arithmetic and multiplication execution units of the CPU and also the memory subsystem. Save my name, email, and website in this browser for the next time I comment. The Phenom II X4 840 outperforms the i5 655k by 30% in this benchmark. – Matt Ring (mdcomp), Biostar GeForce GT240 1GB GDDR5 Video Card Review. If the computer was only used for file compression and rendering, the answer would be simple: more cores equals more performance. The L3 cache is the one glaring omission from this CPU’s specifications. Basically, this is an Athlon II X4 645 plus 100 MHz. This is likely where the lack of L3 cache on the X4 840 comes into play. When overclocking this chip, performance scales almost linearly: a 19% increase in clock speeds yields almost 21% in performance. AMD Phenom II X4 840 : Report a correction: CPUBoss is not aware of any important advantages of the 840 Black Edition vs the 955 Black Edition. For games and 3D performance, it looks like the i5 can compete, even with less real cores. AMD Phenom II X4 840 : AMD FX 4100 : Join the discussion. Overclocking this chip was a breeze. On the i5 the PCIe link is on-die and linked by the QPI, while on the AMD system it has it go through the northbridge. Finally, some conclusive results! AMD did not jack up the price though, so I do not see this as an act of deception: just be aware of the differences when choosing between a Phenom II X4 8xx and 9xx series chip. This is a relatively narrow range which indicates that the AMD Phenom II X4 840 performs reasonably consistently under varying real world conditions. Although we are only talking about a ~13 second difference, in the world of extreme benchmarking a lot of boints might be hanging in the balance. For $100 less, users get over 20% performance boost with the X4 840. In looking at the market, the X4 840 seems like a great value 4-core solution with 100 MHz higher clock speed and priced $17 less than the Athlon II X4 645. When looking at total Vantage score, the i5 does have a 12% edge in performance. nice review, but in the price table listed the 1075T X6 as a 4/4 cpu, just saying. The more interesting question is how the X4 840 compares low-end i5 CPUs (with two cores but four virtual threads) and the rest of the Phenom lineup with L3 cache. This benchmark measures CPU performance using AES (Advanced Encryption Standard) data encryption…AES is used in several compression tools today, like 7z, RAR, WinZip, and also in disk encryption solutions like BitLocker, FileVault (Mac OS X), TrueCrypt. The only possible explanation that comes to mind is the PCIe link. Reasons to consider the For the price and the number of cores, you really can’t beat the Phenom II X4 840 CPU. This chip stood up pretty well to the i5 655k in a lot of tests, which is about $100 more expensive. With such a low price-tag, costs have to be cut somewhere. 1 module 1 in Dresden, Germany, Newegg.com Prices current as of Jan. 18, 2011. At the same clock speed theoretically the processor with the shorter pipeline and smaller misprediction penalties will attain higher benchmark scores…CPU Queen test uses integer MMX, SSE2 and SSSE3 optimizations. The range of scores (95th - 5th percentile) for the AMD Phenom II X4 840 is just 19.5%. Processeur Quad Core Socket AM3 0.045 micron Cache L2 2 Mo (version boîte - garantie constructeur 3 ans). If the X4 645 could be purchased for less than $102, the X4 840 would receive an automatic “fail” from me, since it would be nothing more than sneaky marketing. If we assume the results are accurate, then the i5 655k outperforms the Phenom II x4 840 by about 84% in data encryption tasks. Your email address will not be published. By continuing to use this site we will assume you accept our, AMD Phenom II X4 840 Processor Specifications, Beginner's Guide to Water Cooling Your PC, 64 kB instruction/64 kB data per core (512 kB per CPU), Integrated 128 bit wide memory controller, Up to 2.0 GHz with Dual Dynamic Power Management, One 16/16-bit link at up to 4 GHz full duplex (2 GHz x 2), Up to 37.3 GB/s (21.3 GB/s memory, 16.0 GB/s HT3) with DDR3, Up to 33.1 GB/s (17.1 GB/s memory, 16.0 GB/s HT3) with DDR2, 938-pin Socket AM3 organic micro-pin grid array (mPGA), GlobalFoundries Fab. For $102 can you really complain? 4GHz is, however, pretty respectable for a $100 chip. For half the price, users do actually get half the performance in this example. However, I did run into an issue with the motherboard: generally lower multipliers are available, which greatly helps the overclocking process. This integer benchmark measures combined CPU and memory subsystem performance through the public ZLib compression library. Based on 276,927 user benchmarks for the AMD FX-8350 and the Phenom II X4 840, we rank them both on effective speed and value for money against the best 1,264 CPUs. CPU ZLib test uses only the basic x86 instructions, and it is HyperThreading, multi-processor (SMP) and multi-core (CMP) aware. It is clear though that single-threaded applications see a huge performance gain from the i5 655k vs. X4 840. The 840 has a higher clock while the (Deneb family) 820 has L3 cache. Achat Processeur AMD Phenom II X4 840 (3.2 GHz) (HDX840WFGMBOX) sur LDLC.com, n°1 du high-tech. The results vary significantly and scores are graphed here, not percentages. AIDA64 has replaced Everest: I’ve not got a feel about this suite of synthetic benchmarks yet as I have not been able to test it on a wide-range of different CPUs. This graph makes me question the entire benchmarking suite from AIDA. 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For a 2% increase in price, or $2 more than the Athlon II X4 640, the X4 840 offers a solid 200 MHz boost, or 6% increase in clock speed. Due to the fact that this test performs high memory read/write traffic, it cannot effectively scale in situations where more than 2 processing threads used…CPU PhotoWorxx test uses only the basic x86 instructions, and it is HyperThreading, multi-processor (SMP) and multi-core (CMP) aware. There is about a 5-12% difference depending on which score is analyzed. Again the results don’t vary by much, but it seems like X4 840 gets the slight advantage here once again, but only by 7%. Whether this difference in performance is worth $50 is up to you. Feb 01, 2011: At the beginning of January, AMD announced three Phenom II microprocessors, quad-core X4 840 and 975 Black Edition, and hexa-core 1065T.Although the launch of these models was extensively covered by hardware news sites, and accompanied by large number of published reviews of new Phenom IIs, none of the processors appeared in the retail up to this moment. This result is quite surprising considering the CPU score showed the exact opposite result, with the X4 840 coming out on top. In looking at the results, this test seems to be closely linked to CPU MHz instead vs. number of cores. These results are likely due to the extra cores, stronger memory controller and additional L2 cache on the AMD CPU. Single-threaded SuperPi 1M is where Intel is king. My only complaint is the lack of L3 cache. It is interesting that in SuperPi 32M, sheer MHz seemed to have more of an effect than in 1M. Once again, there i5 655k barely puts up a fight against the X4 840 in this multi-threaded file compression benchmark. I somehow have a hard time accepting that this test is a reflection of data-driven tasks since the x4 840 seemed to beat the i5 655k by about 20% in the 7zip benchmark. With the sort of performance you can see above, there are not a lot of negative things I can say about a $100 product that performs not too dissimilarly from a $200 product. Clocked at high 3.20 GHz, and priced at $102, Phenom II X4 840 is going to compete nicely in this segment. As for the CPU score: the 5% is relatively small and is potentially due to differences in chipsets/platforms between Intel and AMD. Copyright © Overclockers Media Group, LLC | Privacy Policy | Terms of Service. I’d expect another few MHz depending on the batch of processor you receive. With an MSRP of just $102, the new AMD Phenom II X4 840 CPU is one of the cheapest quad-core CPUs on the market. The i5 655k and X4 840 are pretty much on par performance-wise with 3DMark Vantage. Also, despite its mere 200MHz additional clock speed, the X4 965 has a solid 12% performance gain over the X4 840. It is pretty clear the X4 840 will out-duel similarly priced Intel offerings, like the i3-550. Benchmarks Real world tests of Phenom II X4 955 vs 840. GeekBench 3 (Multi-core) Data courtesy Primate Labs. Differences What are the advantages of each. Though this did not affect performance in all tests, naming this chip Phenom instead of Athlon does seem kind of strange. I would have been curious how the 840 stacks up to the 820 because: I wonder if there is unlockable cache on that thing, or whether it's just a rebadged AthII. Those of us who have been following the pricing and performance trends over the past year know that without even looking at the above chart. CPU AES test uses only the basic x86 instructions, and…is HyperThreading, multi-processor (SMP) and multi-core (CMP) aware. No surprises here: the four-core X4 840 trounced the two-core i5 655k in rendering performance. However, the X4 840 is $16 less than the 645, making it a great value. With such a low price-tag, costs have to be cut somewhere. The return of Phenom II X4 800 marks AMD's yet another push to secure its dominance in the budget market, and its first representative, the Phenom II X4 840 has all of the features to continue the legacy of legendary Athlon II X4 620 - the first $100 quad processor.
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