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Thread: AMD - Zen chitchat

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    Re: AMD - Zen chitchat

    Quote Originally Posted by [GSV]Trig View Post
    , but the APU's tend to be a generation behind do they not, so the 4000 series APU's are based on the 3000 CPU's which means B450 should support them,
    Nah, not so simple. It is a completely arbitrary cut off.

    My shiny new mATX B550 Asrock Pro 4 does not support any of the existing APUs. I'm sure before I bought it the 3200G was in the official support list, but either I'm not getting enough sleep or they removed the 3200G/3400G entries (either is believeable). Given I had a 2200G kicking around I tried it anyway, and it was correctly recognised and sort of worked. I say sort of, I told it to enable the XMP memory profile in the DDR4 and it needed a clear CMOS to get it back. Yeah, 3200MHz DDR4 is officially an overclock for that chip, but it mananged it fine in an Asus B450 board. That was different ram though. Still, I suspect it recognises the chip but support isn't quite right. My 3600 turned up this afternoon, so I shall stop mucking about but it was an interesting experiment.

    Quote Originally Posted by [GSV]Trig View Post
    I am leaning into B550, the reason I want the Aorus board is the Intel NIC, however some of the B550 boards have 2.5Gb NIC which would be preferable, however not supporting the 3400g means waiting a few months at least, maybe more for the ”new shiny” pricing to be better, but the B450 does support the APU I want now, and might, with a BIOS update support newer ones, so I'm a bit torn...
    That all sounds rather familiar. I couldn't find a source of 3400G PRO APUs though, so lack of ECC support pushed me back to using the non APU chips. At that point I need both a GPU and a second network card plugged in, so I can't use ITX.

    In the end I just got the B550 on the hope I have less chance of having to pull the whole lot apart because I got a dead end mobo. Firmly on the slipper slope, I went for a 3600 which is a tad overkill as well. Not quite the "bung my existing 2200G onto a cheap B450M" upgrade I originally intended, but I must say it is looking pretty sweet Other than the heatsink which I used the one from my 3700X so it is rather in yer face with the LEDs. I shall have to work out how to switch those off!

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    Re: AMD - Zen chitchat

    I've already got case and RAM, its just board and APU I'm waiting on, the 3400G was the APU I was aiming at, but until any sort of BIOS comes out for B450 boards I'm non the wiser, its a PITA as the missus knows I've sold stuff and is itching to spend the money before I get to buy the things I want, I'm almost tempted to buy the bits I need now new, rather than wait as I know what I have in my basket will work and do what I need it too..

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    Re: AMD - Zen chitchat

    Quote Originally Posted by DanceswithUnix View Post
    ...Other than the heatsink which I used the one from my 3700X so it is rather in yer face with the LEDs. I shall have to work out how to switch those off!
    Once you get the fan unclipped from the heatsink the case comes apart fairly easily, and IIRC the RGB bits are run off a 12 V spur from the fan supply so can be snipped/desoldered off. I had mine in my HTPC for a bit (although the lenovo motherboard didn't like it, so it's not in there now) as it's the only 92mm RGB fan I could find

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    Re: AMD - Zen chitchat

    Quote Originally Posted by Xlucine View Post
    Once you get the fan unclipped from the heatsink the case comes apart fairly easily, and IIRC the RGB bits are run off a 12 V spur from the fan supply so can be snipped/desoldered off.
    I'll take the side cutters to it as last resort. The thing came with two cable options to control the LEDs, and I guess I should learn how these things work in case someone asks advice and doesn't take "Ewww, just no" as an answer That way I can just turn the LEDs off. Not sure which cable to try first, the USB connector or the motherboard 4 pin header. Guess I should check over what the motherboard has.

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    Re: AMD - Zen chitchat

    I'm having issues with my brand new 3900XT running slow, is this the right thread to ask about that kind of thing?

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    Re: AMD - Zen chitchat

    Some more information about Zen3:
    https://adoredtv.com/exclusive-zen-3...-in-september/



    Those despicable Elk,stealing the pond weed!

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    Re: AMD - Zen chitchat

    20% in integer workloads would be very impressive. 24 seconds off a 2 minute compile task? Wouldn't say no.

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    Re: AMD - Zen chitchat

    I just want to know what the new Ryzen 5 series of APU's will do as I'm looking at the 3400g to go in my server, so it'll be a second hand one of those, or if the new APU's are a decent chunk better without breaking the bank then one of those will go in my x570 ITX home build..

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    Re: AMD - Zen chitchat

    Quote Originally Posted by DanceswithUnix View Post
    20% in integer workloads would be very impressive. 24 seconds off a 2 minute compile task? Wouldn't say no.
    AFAIK, there are Epyc leaks, and another leak saying 20% at low core counts and only 10-15% or so at higher core counts.
    So that seems that it has to be a combination of clocks and IPC. So we'd be back to the rumour of 15% or so, plus maybe 5% from clocks?

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    Re: AMD - Zen chitchat

    Quote Originally Posted by siva80 View Post
    I'm having issues with my brand new 3900XT running slow, is this the right thread to ask about that kind of thing?
    Try posting here you may get more support related just to your issue rather than mixed in with all the other replies on here

    https://forums.hexus.net/cpus/
    Jon

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    Senior Member watercooled's Avatar
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    Re: AMD - Zen chitchat

    Quote Originally Posted by kompukare View Post
    AFAIK, there are Epyc leaks, and another leak saying 20% at low core counts and only 10-15% or so at higher core counts.
    So that seems that it has to be a combination of clocks and IPC. So we'd be back to the rumour of 15% or so, plus maybe 5% from clocks?
    You also have to factor in power at high core counts. It's possible that Zen3 cores use more absolute power per core at shipping clocks, and they're still on 7nm.

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    Re: AMD - Zen chitchat

    The Decima engine in Death Stranding is very well optimised for Ryzen CPUs.

    GameGPU.



    Computerbase.de




    https://www.youtube.com/watch?v=FP4A...=youtu.be&t=51


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    Re: AMD - Zen chitchat

    Alleged suicide runs on the 4700G mentioned on the AT Renoir thread [link]:



    High core, low memory and no score, temps, or power usage. Over 1.5v sounds like a short life though.

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    Re: AMD - Zen chitchat

    I guess this relats to Zen as the guy ran the design team, it doesn't go into zen specifics but i found it an interesting listen all the same..


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    Re: AMD - Zen chitchat

    First review of the desktop Renoir APUs:
    https://quasarzone.com/bbs/qc_bench/views/52694
    https://forums.overclockers.co.uk/posts/33793711/

    The 4350G,4650G and 4750G are tested.

    Having the IMC on the same die,seems to mean Renoir can run much higher memory speeds. OTH,the lower memory-CCX latency is not having such a large effect on performance,and even the L3 cache reduction,is having less of an effect than expected. So it means the CCX-CCX latency is still the major problem with Zen2,hence why Zen3 is probably moving to an 8 core CCX/CCD.
    Last edited by CAT-THE-FIFTH; 27-07-2020 at 06:52 PM.


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    Re: AMD - Zen chitchat

    Interesting. I'm not completely sure if they're using the same motherboard across 3000 and 4000 but the 4000 series appears to have comparable or slightly lower idle power draw. It makes sense given how they perform on mobile, but idle power is curiously high on the existing 4000 desktop CPUs. I know it's not a huge deal, just something I found peculiar.

    It was hard to separate out CPU and chipset though as most launch reviews seemed to test only 3000 with X570 vs 2000 with a 400 series chipset. The chipset power was notably higher but IIRC the idle power of the CPU itself was also slightly more.
    Last edited by watercooled; 27-07-2020 at 07:44 PM.

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