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*** AMD "Zen" thread (inc AM4/APU discussion) ***

Some food for thought which I posted in the memory thread.

First off we had some rumours about weak IMC due to supposedly low speed. This was followed by a rumour that actually Zen had insane efficiency way above Intel and as such lower speeds actually had same performance as higher on Intel.

http://ranker.sisoftware.net/show_r...e4dceadceddae3c5b78aba9cf99ca191b7c4f9c9&l=en

This is a Zen getting 33.99GB/s out of 2133Mhz memory, which has a theoretical maximum bandwidth of 34.128GB/s... meaning, epic efficiency.

For comparison you have

http://ranker.sisoftware.net/show_r...e4dcefdae3d5e7c1b38ebe98fd98a595b3c0fdcd&l=en

Broadwell-e with 3200Mhz memory achieving 74.97GB/s with max theoretical of 102.4GB/s, so around 75% efficiency.

http://ranker.sisoftware.net/show_r...e4d3ebd3ead3e6c0b28fbf99fc99a494b2c1fccc&l=en

Skylake with similar (lower latency though) memory achieving 26.52GB/s at 2133Mhz, with obviously max theoretical of 34.128GB/s. A little over 75% efficiency. Another way to look at the results, if true, is that Zen has 28% higher bandwidth at the same memory speed.

If that scales at the same rate then 2666Mhz on Zen would give the same bandwidth that Skylake(and thus Kaby) would at 3400Mhz.

Along with those rumours was a mention that Zen was currently locked at 1t, we also have Asus managing to get higher memory speed. I wonder if Asus unlocked some settings that aren't supposed to be unlocked yet and in doing so managed to lower timings to up memory speeds, but sacrificing efficiency.

Basically I'm just trying to say, heads up, new platform, don't assume 2666Mhz is even bad, OR that 3200Mhz(at potentially much lower timings) is automatically better than 2666Mhz.

http://www.corsair.com/en-eu/blog/2014/september/ddr3_vs_ddr4_synthetic

Posted this before, but another thing to bear in mind, Haswell tanked in bandwidth efficiency after 2400mhz. We absolutely do not know that super fast memory speeds will bring ANY better performance yet. I mean Sisoft doesn't usually get faked afaik, and the result fits with some rumour 1-2 weeks back, it would also explain most issues of getting higher memory speeds.

I would say, don't jump on a £250 board because someone is telling you 3200Mhz needs a £250 board, because we don't even know if 3200Mhz is faster, besides the fact that I fully expect lots of cheaper boards to be updated and tweaked to achieve ballpark similar clock speeds at some point anyway.
 
Techen said:
If they can get the 1800k to sit at 4.4ghz, I reckon AMD are going to be selling a lot more CPUs...
Click to expand...

I imagine thats a best case that will require a custom water cooled set up, There may be a small percentage that can do it on an aio, But for now we don't have a clue how consistent they are.
 
Last edited:
drunkenmaster said:
Some food for thought which I posted in the memory thread.

First off we had some rumours about weak IMC due to supposedly low speed. This was followed by a rumour that actually Zen had insane efficiency way above Intel and as such lower speeds actually had same performance as higher on Intel.

http://ranker.sisoftware.net/show_r...e4dceadceddae3c5b78aba9cf99ca191b7c4f9c9&l=en

This is a Zen getting 33.99GB/s out of 2133Mhz memory, which has a theoretical maximum bandwidth of 34.128GB/s... meaning, epic efficiency.

For comparison you have

http://ranker.sisoftware.net/show_r...e4dcefdae3d5e7c1b38ebe98fd98a595b3c0fdcd&l=en

Broadwell-e with 3200Mhz memory achieving 74.97GB/s with max theoretical of 102.4GB/s, so around 75% efficiency.

http://ranker.sisoftware.net/show_r...e4d3ebd3ead3e6c0b28fbf99fc99a494b2c1fccc&l=en

Skylake with similar (lower latency though) memory achieving 26.52GB/s at 2133Mhz, with obviously max theoretical of 34.128GB/s. A little over 75% efficiency. Another way to look at the results, if true, is that Zen has 28% higher bandwidth at the same memory speed.

If that scales at the same rate then 2666Mhz on Zen would give the same bandwidth that Skylake(and thus Kaby) would at 3400Mhz.

Along with those rumours was a mention that Zen was currently locked at 1t, we also have Asus managing to get higher memory speed. I wonder if Asus unlocked some settings that aren't supposed to be unlocked yet and in doing so managed to lower timings to up memory speeds, but sacrificing efficiency.

Basically I'm just trying to say, heads up, new platform, don't assume 2666Mhz is even bad, OR that 3200Mhz(at potentially much lower timings) is automatically better than 2666Mhz.

http://www.corsair.com/en-eu/blog/2014/september/ddr3_vs_ddr4_synthetic

Posted this before, but another thing to bear in mind, Haswell tanked in bandwidth efficiency after 2400mhz. We absolutely do not know that super fast memory speeds will bring ANY better performance yet. I mean Sisoft doesn't usually get faked afaik, and the result fits with some rumour 1-2 weeks back, it would also explain most issues of getting higher memory speeds.

I would say, don't jump on a £250 board because someone is telling you 3200Mhz needs a £250 board, because we don't even know if 3200Mhz is faster, besides the fact that I fully expect lots of cheaper boards to be updated and tweaked to achieve ballpark similar clock speeds at some point anyway.
Click to expand...


drunken i do love reading your posts and i do learn a lot from them but your profile name is so misleading... i am actually very drunk...you have just written all that whilst i am dreaming of kebabs and dribbling down my face..

I do not believe you are the real drunken master :)
 
Think I may jump in with a 1700 non x.

I have next weekend off and if don't do it then, might not find time for ages.

May just pull out all watercooling and go back to air as well.

Probably just a middle of the road x370 board.

Maybe. Might just rather get out with my camera next weekend...
 
eyetrip said:
Think I may jump in with a 1700 non x.

I have next weekend off and if don't do it then, might not find time for ages.

May just pull out all watercooling and go back to air as well.

Probably just a middle of the road x370 board.

Maybe. Might just rather get out with my camera next weekend...
Click to expand...

I think you may find stock tight for turning up next weekend dude.

just seen your power supply what the hell are you running in your machine ? ha
 
drunkenmaster said:
Some food for thought which I posted in the memory thread.

First off we had some rumours about weak IMC due to supposedly low speed. This was followed by a rumour that actually Zen had insane efficiency way above Intel and as such lower speeds actually had same performance as higher on Intel.

http://ranker.sisoftware.net/show_r...e4dceadceddae3c5b78aba9cf99ca191b7c4f9c9&l=en

This is a Zen getting 33.99GB/s out of 2133Mhz memory, which has a theoretical maximum bandwidth of 34.128GB/s... meaning, epic efficiency.

For comparison you have

http://ranker.sisoftware.net/show_r...e4dcefdae3d5e7c1b38ebe98fd98a595b3c0fdcd&l=en

Broadwell-e with 3200Mhz memory achieving 74.97GB/s with max theoretical of 102.4GB/s, so around 75% efficiency.

http://ranker.sisoftware.net/show_r...e4d3ebd3ead3e6c0b28fbf99fc99a494b2c1fccc&l=en

Skylake with similar (lower latency though) memory achieving 26.52GB/s at 2133Mhz, with obviously max theoretical of 34.128GB/s. A little over 75% efficiency. Another way to look at the results, if true, is that Zen has 28% higher bandwidth at the same memory speed.

If that scales at the same rate then 2666Mhz on Zen would give the same bandwidth that Skylake(and thus Kaby) would at 3400Mhz.

Along with those rumours was a mention that Zen was currently locked at 1t, we also have Asus managing to get higher memory speed. I wonder if Asus unlocked some settings that aren't supposed to be unlocked yet and in doing so managed to lower timings to up memory speeds, but sacrificing efficiency.

Basically I'm just trying to say, heads up, new platform, don't assume 2666Mhz is even bad, OR that 3200Mhz(at potentially much lower timings) is automatically better than 2666Mhz.

http://www.corsair.com/en-eu/blog/2014/september/ddr3_vs_ddr4_synthetic

Posted this before, but another thing to bear in mind, Haswell tanked in bandwidth efficiency after 2400mhz. We absolutely do not know that super fast memory speeds will bring ANY better performance yet. I mean Sisoft doesn't usually get faked afaik, and the result fits with some rumour 1-2 weeks back, it would also explain most issues of getting higher memory speeds.

I would say, don't jump on a £250 board because someone is telling you 3200Mhz needs a £250 board, because we don't even know if 3200Mhz is faster, besides the fact that I fully expect lots of cheaper boards to be updated and tweaked to achieve ballpark similar clock speeds at some point anyway.
Click to expand...

"meaning, epic efficiency."

Choo Choo
 
Panos said:
Probably in the past owned a 295X2.... Saying that because I have a SF 1000W Platinum for exactly the same reason....
Click to expand...


you think that is bad i ran 2x 7990's it cost me a fortune lol, they were under water but my god the power the 4 gpus took was crazy, the 295x2 had a lower draw and a hell of a lot more power :)
 
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