Archive Home arrow Reviews: arrow Processors arrow AMD Athlon-II X2-255 CPU ADX255OCGQBOX

AMD Athlon-II X2-255 CPU ADX255OCGQBOX E-mail
Reviews - Featured Reviews: Processors
Written by Hank Tolman   
Monday, 29 March 2010
Table of Contents: Page Index
Features and Specifications
Closer Look: Athlon-II X2-255
Testing and Results
EVEREST Benchmark Tests
Passmark PerformanceTest
PCMark Vantage Benchmark Tests
SiSoftware Sandra
Video Game Benchmarks
Final Thoughts and Conclusion

AMD Athlon-II X2 Final Thoughts

The launch of the Athlon II brand marks a complete 45nm refresh of AMD's mainstream and enthusiast processors. On the high end, we have the Phenom-II X4's and X3's that launched a few months ago. Below that will be the recently launched Phenom-II X2 series, although some of these may actually be faster than the low end X3's in single-threaded applications. That leaves the Athlon-II X2's one notch lower, sitting directly in the mainstream market segment. The performance we've seen throughout our testing shows the Athlon-II X2-255 outperforming a similarly (although lower) priced Intel Dual Core CPU. It also represents an excellent upgrade opportunity from an older Conroe based Core 2 Duo CPU. The Athlon-II X2-255, along with other low priced AMD processors in the Athlon-II and Phenom-II line should be taken into consideration when evaluating your options for upgrading a machine that is getting to be out of date, especially when a new motherboard is a necessity as well.

We represented the Conroe based Core 2 Duo in this article to show this exact scenario. While the NEO P965 motherboard is an LGA775 board, it will not support newer Wolfdale Intel LGA775 processors. This severely limits the upgradeability of this motherboard, causing most users to need a new motherboard altogether. While the newer LGA775 motherboard used in the Dual Core platform will accept newer Intel LGA775 processors, we have shown that the Athlon-II X2-255 outperforms similary priced LGA775 CPUs. It is likely that this result will carry forward with other Athlon-II and Phenom-II processors.


Continuing on with AMD's Ahtlon-II line, X3 and X4 processors have been released. In fact, AMD now offers a quad-core processor for under $100. The Athlon-II line is certainly set to provide budget minded users with a whole new array of possibilities. Without the cache, the Athlon-II's will be a bit slower than their Intel counterparts in some applications, but will also be less expensive and consume less power.

ADX255OGQBOX Conclusion

The Athlon-II X2-255 performed very well against our Intel processors. The goal of this article was to find out how viable the Athlon-II X2-255 is as an upgrade option for budget minded users who want to get more out of their computers. Many users may not have uprgaded in quite a while. The Athlon-II X2-255's performance shows that it can beat a similarly priced Pentium Dual Core processor nearly across the board. The X2-255 also provides an impressive boost for users running older systems such as the Conroe based Core 2 Duo used in this review. Without a decent graphics card, the Athlon-II X2-255 is unable to play the latest games, but this shouldn't be an issue for most users looking to upgrade to the X2-255.

The Athlon-II X2-255 passed our stress test and completed all benchmarks without a hint of instability. Even overclocked to 3.8GHz, the X2-255 never faltered. It seems that the only difference between the X2-255 and the X2-250 is the higher stock CPU multiplier. This alludes to the fact that the AMD Athlon-II chips have seen improving yields over the course of their production. The latest additions to the Athlon-II line, including the Athlon-II X2-255 will be at least as stable as their forerunners and likely more so. Any one wanting to try their hand in the overclocking market that needs to operate on a budget would have a lot of fun with the Athlon-II X2-255.

AMD has made it possible for their Athlon-II line to run in AM2+ motherboards as well as AM3 motherboards. This allows the door to be wide open for the choice of motherboard with which the Athlon-II X2-255 will function. The motherboard we used to test the Athlon-II X2-255 is the ASUS M4A785TD-M EVO AM3 motherboard using the 785G Chipset. The Athlon-II X2-255 functions extraodinarily well with this motherboard. I would expect that the X2-255 be used with a lower priced motherboard such as this in order to maintain the budget appeal of the processor.

The Athlon-II X2-255, with its 45nm process and low TDP of 65W, is an excellent overclocker. The X2-255 is not a black edition processor, so we were working with a locked multiplier of 15.5. We could lower the multiplier through the BIOS, but not increase it. Even so, just using the bus speed and voltage, we were able to get the Athlon-II X2-255 to 3.8GHz cooled only with air. This represents nearly a 23% increase in the clock speed of the X2-255. We were able to reach 4.0GHz as well, but the stress testing proved to be too much and the processor failed at that level. With some more tweaking, it will likely be possible to reach a stable 4.0GHz, as it took over 9 hours of stressing to cause the Athlon-II X2-255 to fail at that speed.

AMD's ADX255OGQBOX retail kit is available online for only $74.99, which means the Athlon-II X2-255 is priced to sell. While enthusiasts and hard-core gamers will find that the X2-255 doesn't offer the frame rates they desire, any user working with a computer that is over a couple of years old will find that the Athlon-II X2-255 offers an amazing bang for the buck. While the Athlon-II X2-255 doesn't have the L3 cache offered by the Phenom processors, it still outperforms similarly priced Intel process as we saw in most of the tests against the Pentium Dual Core E5300.

Pros:Benchmark Reviews Golden Tachometer Award

+ Excellent price/performance ratio
+ AM3/AM2+ compatibility
+ Great Overclocker
+ DDR3 support
+ Efficient 45nm process
+ Virtualization Support


- No notable flaws


  • Performance: 9.0
  • Construction: 9.5
  • Functionality: 9.5
  • Overclock: 9.25
  • Value: 9.5

Final Score: 9.35 out of 10.

Excellence Achievement: Benchmark Reviews Golden Tachometer Award.

Questions? Comments? Benchmark Reviews really wants your feedback. We invite you to leave your remarks in our Discussion Forum.

Related Articles:



# Great read with one flawBrian 2010-03-30 06:41
I like the read. It had great set of info for my next build, but I see a small flaw in the test. You said in the description that the FSB was eliminated because then the data transfer will be a whole lot faster than with a FSB, but I would like to know since the E6300 FSB is 1066Mhz, and the E5300 FSB is 800Mhz, what would happen with the Intel processor with a FSB of 1333MHz? The tests are sound don't get me wrong, but I would like to see what will the outcome will be with this processor. I use both AMD and Intel at home, and I see a great difference between them. but I would like to know more when it comes with a higher FSB? Still a great read, a job well done.
Report Comment
# Contributing EditorHank 2010-03-30 07:40
I'm sorry, but I am extremely confused by your comment. I don't know how it would be possible to eliminate the FSB. Also, if I were to use an Intel processor with an FSB of 1333MHz it would certainly be faster than the Athlon-II X2-255, considering the least expensive of these would be a Core 2 Quad at about $160 or so. We don't need benchmarks to tell us that the Core 2 Quad will come out ahead. If I'm way off and you are talking about something else altogether, could you rephrase you question for me?
Hope this helps,

Report Comment
# RE: Contributing EditorBrian 2010-03-30 08:09
Thanks for the reply, to rephrase the question, there are dual core processors that have a FSB of 1333Mhz, i.e Intel E8500. Since this is just a dual core processor, how will something like the E8500 or the E6750 go against the Athlon II X2 which has no FSB?
Report Comment
# RE: RE: Contributing EditorHank 2010-03-30 09:41
Ok, I see what you mean. The processors with a 1333MHz FSB would likely all outperform the Athlon-II X2-255. The increase FSB speed would make a difference, but so would the 4MB of L2 cache. The processors used in this review were picked to test the upgradeability of the Athlon-II X2-255, and also to show its performance relative to its price. Even the E6750 will run you nearly twice what the Athlon-II X2-255, so you can expect that it will do better. But will it do twice as well as the X2-255? It's all about what you are willing to spend, as well. Paired with a 785G motherboard, like in the review, the processor/mb combo is only $150. You would be spending that on just the processor for a 1333MHz Core 2 Duo, and you wouldn't get the Radeon HD 4200. :)
Report Comment
# RE: RE: Contributing EditorHank 2010-03-30 09:50
I don't there is an Intel competitor that can match the performance of the X2-255 for the same price. I think to get a processor that will beat the X2-255, you need to look at the Pentium E6500, and even that might be close. The Core 2 Duos, even the E7500 at just over $100 will outperform the X2-255, and certainly the i3-530 at $120. You'd have to compare those, however, to the Phenom-II X2-555 or maybe the Athlon-II X4-630 to get a better idea of AMD/Intel matchup.
Report Comment
# RE: RE: Contributing EditorBrian 2010-03-30 14:55
Well if you put it that way than that's actually more understandable, I was just wondering why the 1333Mhz dual core processor was not on the list for some reason. But thanks for the replies, it was still a very informative reading. :)
Report Comment
# RE: AMD Athlon-II X2-255 CPU ADX255OCGQBOXJohn D mathis 2011-02-04 19:24
Intersting read, informative, factual, and utilitarian. I am contemplating an upgrade on my Velocity Micro lemon, w/Intel mobo, E6600 CpU, andhaving replaced the Mobo, video card, snd card, re-installed XP Home, several times over the three years, I look longingly at the AMD line in an Asus Mobo. It appears that AMD-Asus kit would be the way to go, based on the near 20 years my Compaq (AMD cpu) has lasted w/o a hitch.Caveat other than the Creative Snd Card, always a problem configuring. Couple that with not having to replace snd, video and Net card and the value goes way up. Doing the owrk myself, a no brainer with today's modular designs, makes the AMD a GREATER value. Bit more inot the Mobo, and still save about 50% over Intel's inflated prices and w/o the arrogance of their deaf "help desk". You guys are great, saved me a tone of money, aguish and KEEP up the good work.
Report Comment

Comments have been disabled by the administrator.

Search Benchmark Reviews

Like Benchmark Reviews on FacebookFollow Benchmark Reviews on Twitter