Athlon X4 845 vs 860K vs 880K

Amyrro

Reputable
Oct 23, 2015
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Hello everyone

I was checking the PassMark's web page of the processor single-threaded performance, when I found that the Athlon X4 845 scored 1,773, which is close to A10-7890K's 1,716, and considerbly (in relation), larger than the scores of A10-7870K (1,529), X4 880K (1,532) and X4 860K (1,596). This made me initially think that Athlon X4 845 would deliver the highest overall performance, since all of the processors have the same core count, only to find on the overll performance page that this is not the case.

1-)
My first question is how could the X4 845 deliver higher single-threaded performance than the X4 860K, which is (the latter) in turn scoring higher than the X4 880K. This is although the the three processors are from the same generation, and have virtually the same architecture, and their clock speeds are inversely proportional to their single-threaded scores, as X4 880K which scored the least among the the three athlons, has the highest clock speed. This sounds counter-intuitive

http://www.cpubenchmark.net/singleThread.html

2-)
Since the X845 has the highest single threaded performance, how did the 3 Athlons score very close results in the benchmark of the overall performance. Especially, since the the three processors have the same architecture, from the same generation ?! This also sounds very counter-intuitive. The three processors are supposed to be one family with scales of performance.

http://www.cpubenchmark.net/high_end_cpus.html


Sorry for the long thread
Thanks in advance
Regards
 
Solution
Simply put, Passmark is not a good benchmark.

Longer answer:

The Athlon x4 845 is not the same architecture as the other CPUs, and so it performs differently. Every other FM2+ CPU is built using AMD's 3rd generation Steamroller cores, while the 845 uses the 4th generation Excavator cores, which have a number of improvements that help single-threaded performance. However, Excavator was primarily designed for BGA mobile CPUs, and to reduce power, and AMD seemingly has had trouble clocking it high for desktop uses, so you're not going to see an unlocked part. Excavator was also seemingly not designed for the desktop socket FM2+ and has had some things disabled to make it work. Compared with the mobile versions of Excavator found in...
Simply put, Passmark is not a good benchmark.

Longer answer:

The Athlon x4 845 is not the same architecture as the other CPUs, and so it performs differently. Every other FM2+ CPU is built using AMD's 3rd generation Steamroller cores, while the 845 uses the 4th generation Excavator cores, which have a number of improvements that help single-threaded performance. However, Excavator was primarily designed for BGA mobile CPUs, and to reduce power, and AMD seemingly has had trouble clocking it high for desktop uses, so you're not going to see an unlocked part. Excavator was also seemingly not designed for the desktop socket FM2+ and has had some things disabled to make it work. Compared with the mobile versions of Excavator found in laptops, the 845 has half of its L2 cache disabled, the iGPU disabled, and is also limited to 8x PCIe lanes.

You can read about it more here:

http://www.anandtech.com/show/10436/amd-carrizo-tested-generational-deep-dive-athlon-x4-845
 
Solution
Jun 5, 2018
5
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Passmark is not a good benchmark? Passmark is most trusted benchmark. there is not a benchmark which is 90% correct. Real life benchmark, when you tested two product on same system,this is only 100% correct. here on net,if show 70% correct,this is amazing then. But I dont know which is that correct. Passmark is one of first,he make results which he get FROM US! you upload score which you get using Passmark software. CPUBoss,is ok,not correct like passmark but this two most used. Userbenchmark,most incorrect benchmark ever,you come one the site and you vote! fanboys... wtf is this for benchmark? Real life-Real benchmark. I have and 860K and 845 like many others and from AMD and Intel. With Intel always problems,bugs,viruses etc... with AMD,never. 860K-40$ and just look this,gaming with pair Titan X in SLI!!!! same FPS like i7-5960X. and 845 is almost same like 860K. lokk,that is all: https://wccftech.com/wccftech-star-wars-battlefront-performance-analysis/