4 ms·

AMD Ryzen 1800X vs. Intel Core i7-7700K hash cracking benchmarks

21 points by dchest 9y ago

ruajoke 9y ago
How did this unsubstantiated and offensive message board link make it to the front page of HN?
- smcl 9y ago
  There was a lot of pretty positive Ryzen coverage around in the last couple of months, so I suspect when something challenges that it piques people's interest and gets a few upvotes in quick succession. I agree that the tone is pretty juvenile, however - it's not something I'd expect or want to see on HN :-)
  - pedrocr 9y ago
    Seems like it was bumped off the front page with great prejudice...
    - chinhodado 9y ago
      Yeah I can't even find this thread on the first few pages anymore. Such a shame HN can't get over the tone of the thread to discuss the details.
solotronics 9y ago
its been proven that Nvidia graphics card drivers are behind with AMD CPUs. Wether this is purposeful or just that the drivers are not as fleshed out hasn't been proven. For a more complete test they should have added Ryzen + dual 580 i7-7700k + dual 580
- chinhodado 9y ago
  Isn't this test CPU only?
antisthenes 9y ago
So is there any reason to use a CPU for actual hash cracking instead of a GPU? You'd probably use a CPU to hash user passwords at login and signup, but outside of that is there any reason to?
- Laaas 9y ago
  If you didn't have a GPU?
chinhodado 9y ago
> And speaking of AVX2, this test was important because it confirms that Ryzen's AVX2 support is a bold-faced lie. Yeah the instructions are there, but they don't have any 256-bit registers, so you gain nothing by using AVX2. Is this true? That's pretty damning.
- Laaas 9y ago
  It's not really a lie, but technically the Ryzen architecture doesn't have 256-bit instructions internally. Not like it matter much to you though, because these are all implementation details, and don't really make a difference for you, other than changing how you should optimise your code for max speed.
Laaas 9y ago
600% faster is absolutely unbelievable. According to Agner's observations, this should not be true at all: http://www.agner.org/optimize/microarchitecture.pdf http://www.agner.org/optimize/microarchitecture.pdf. The Ryzen architecture apparently has half throughput for 256-bit vectors instructions compared to 128-bit vector instructions, while Skylake (no data for Kaby Lake yet) has full throughput for 256-bit vectors. Since the 1800X has twice the cores, it should be about the same throughput if all cores are used, so if it isn't multi-threaded, worst case should be half, no? This guy also seems a bit biased »it has to throttle itself down below the base clock to prevent itself from imploding -- just like their GPUs!«. There is also a benefit to using 256-bit instructions, contrary to what he says: They're more dense than having 2 separate 128-bit instructions. I wouldn't call it a bold-faced lie either, it's not like they said »Using 256-bit vector instructions is much faster than using 128-bit vector instructions!«.
emergie 9y ago
i really wanted to buy a ryzen, but it seams it is unstable under a heavy workload https://forums.gentoo.org/viewtopic-t-1061546-postdays-0-postorder-asc-start-175.html?sid=b0f6cf1ca43d0576fe17141790552ab8 https://forums.gentoo.org/viewtopic-t-1061546-postdays-0-pos... i will probably have to wait for intel -X chips or buy a e3 v6 xeon :/
chemmail 9y ago
I sold one of my extra 6700k and had $320 hold burning in my wallet and almost bought a 7700k but got a ryzen 1700 instead to try it out. The MSI mobo was terrible, but i get nearly double the crytonight hashrate of my 4.6GHz 6700k with the 1700 @ 3.9GHz which was pretty easy to do. Temps are around 60C with stock wraith cooler and only takes about 110watts full system hashing. I'd say ryzen is a nice win. Skylake X and Coffee Lake though look like a pretty nice improvement from left field. AMD might have some problems fighting those.
microwavecamera 9y ago
Regardless AMD's push back into high end processors is beneficial to everyone. Notice how fast Intel dropped prices and released new processors, like the core i9. At least it will finally end the whole overpriced tick/tock Intel release "roadmap". Intel has been sitting on this stuff all along and just strings everyone out because what else are you going to buy?

21 points by dchest 9y ago

ruajoke 9y ago

How did this unsubstantiated and offensive message board link make it to the front page of HN?

smcl 9y ago
There was a lot of pretty positive Ryzen coverage around in the last couple of months, so I suspect when something challenges that it piques people's interest and gets a few upvotes in quick succession. I agree that the tone is pretty juvenile, however - it's not something I'd expect or want to see on HN :-)
- pedrocr 9y ago
  Seems like it was bumped off the front page with great prejudice...
  - chinhodado 9y ago
    Yeah I can't even find this thread on the first few pages anymore. Such a shame HN can't get over the tone of the thread to discuss the details.

solotronics 9y ago

its been proven that Nvidia graphics card drivers are behind with AMD CPUs. Wether this is purposeful or just that the drivers are not as fleshed out hasn't been proven. For a more complete test they should have added Ryzen + dual 580 i7-7700k + dual 580

chinhodado 9y ago
Isn't this test CPU only?

antisthenes 9y ago

So is there any reason to use a CPU for actual hash cracking instead of a GPU? You'd probably use a CPU to hash user passwords at login and signup, but outside of that is there any reason to?

Laaas 9y ago
If you didn't have a GPU?

chinhodado 9y ago

> And speaking of AVX2, this test was important because it confirms that Ryzen's AVX2 support is a bold-faced lie. Yeah the instructions are there, but they don't have any 256-bit registers, so you gain nothing by using AVX2. Is this true? That's pretty damning.

Laaas 9y ago
It's not really a lie, but technically the Ryzen architecture doesn't have 256-bit instructions internally. Not like it matter much to you though, because these are all implementation details, and don't really make a difference for you, other than changing how you should optimise your code for max speed.

Laaas 9y ago

600% faster is absolutely unbelievable. According to Agner's observations, this should not be true at all: http://www.agner.org/optimize/microarchitecture.pdf http://www.agner.org/optimize/microarchitecture.pdf. The Ryzen architecture apparently has half throughput for 256-bit vectors instructions compared to 128-bit vector instructions, while Skylake (no data for Kaby Lake yet) has full throughput for 256-bit vectors. Since the 1800X has twice the cores, it should be about the same throughput if all cores are used, so if it isn't multi-threaded, worst case should be half, no? This guy also seems a bit biased »it has to throttle itself down below the base clock to prevent itself from imploding -- just like their GPUs!«. There is also a benefit to using 256-bit instructions, contrary to what he says: They're more dense than having 2 separate 128-bit instructions. I wouldn't call it a bold-faced lie either, it's not like they said »Using 256-bit vector instructions is much faster than using 128-bit vector instructions!«.

emergie 9y ago

i really wanted to buy a ryzen, but it seams it is unstable under a heavy workload https://forums.gentoo.org/viewtopic-t-1061546-postdays-0-postorder-asc-start-175.html?sid=b0f6cf1ca43d0576fe17141790552ab8 https://forums.gentoo.org/viewtopic-t-1061546-postdays-0-pos... i will probably have to wait for intel -X chips or buy a e3 v6 xeon :/

chemmail 9y ago

I sold one of my extra 6700k and had $320 hold burning in my wallet and almost bought a 7700k but got a ryzen 1700 instead to try it out. The MSI mobo was terrible, but i get nearly double the crytonight hashrate of my 4.6GHz 6700k with the 1700 @ 3.9GHz which was pretty easy to do. Temps are around 60C with stock wraith cooler and only takes about 110watts full system hashing. I'd say ryzen is a nice win. Skylake X and Coffee Lake though look like a pretty nice improvement from left field. AMD might have some problems fighting those.

microwavecamera 9y ago

Regardless AMD's push back into high end processors is beneficial to everyone. Notice how fast Intel dropped prices and released new processors, like the core i9. At least it will finally end the whole overpriced tick/tock Intel release "roadmap". Intel has been sitting on this stuff all along and just strings everyone out because what else are you going to buy?