• Competitor rules

    Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.

Poll: Ryzen 7950X3D, 7900X3D, 7800X3D

Will you be purchasing the 7800X3D on the 6th?

  • Total voters
    191
  • Poll closed .
LtMatt said:
Leave that till then end once you have memory and curve optimiser sorted, then you can play around with it.

Most samples will do somewhere between 2067-2167Mhz. Higher is better but the biggest performance gains will come from the above rather than FCLK.

Stability test of Karhu with cache enabled running overnight is a good way to test FCLK (and memory) stability.

If FCLK is too high the system performance can drop (can verify using Aida64 latency/bandwidth or with Karhu hover your mouse over the % sign when testing stability) or the system may randomly restart. However, that can also be caused by too much curve optimiser on your best cores, so you need to take a methodical approach to tuning both.

I highly recommend Karhu for stability testing btw, its one of the best and well worth the small cost to buy to own. I use it more than TM5 these days.

Yeah it's not a huge deal but having it enabled adds a little bit of latency. People moan about longer boot times so you have memory context restore (MCR) enabled but that also means you need gear down mode (GDM) enabled on AMD which has a small latency cost.
That's why I keep MCR off and GDM off and put up with a ten second longer boot time and lower latency = better performance. :)
Click to expand...
Morning!

I applied the timings and there's already an improvement as you can see. So that's awesome.

gnzxLlC.jpg


I couldn't find Gear Down Mode in the bios. Any idea what else it could be under or called?

Also, I'm not confident that I got the voltage info correct. Would you mind just having a quick glance to see all is ok?


nmwKh2l.jpg


gxcG78G.jpg


I ran Karhu last night and after 22min it stopped with 1 error. I didn't know if I should just untick stop on error, but I'm guessing that any error is not good.
pqhXAcq.jpg

Thanks a million LtMatt. Much appreciated.
 
Last edited:
01001101 said:
Morning!

I applied the timings and there's already an improvement as you can see. So that's awesome.

gnzxLlC.jpg


I couldn't find Gear Down Mode in the bios. Any idea what else it could be under or called?

Also, I'm not confident that I got the voltage info correct. Would you mind just having a quick glance to see all is ok?


nmwKh2l.jpg


gxcG78G.jpg


I ran Karhu last night and after 22min it stopped with 1 error. I didn't know if I should just untick stop on error, but I'm guessing that any error is not good.
pqhXAcq.jpg

Thanks a million LtMatt. Much appreciated.
Click to expand...
WRWRSD needs to be 2.
WRWRSC needs to be 1.

SOC voltage drop to 1.25v - 1.3v in BIOS.

Enter DRAM menu scroll to the bottom and look for an option called CMD Mode and set to Buf. If the option does not exist your board doesn't have it I guess.

Bump DRAM voltage to 1.41v and VDDQ to 1.31v and retest.

EDIT - @01001101 See my edit above, you have a couple of timings wrong.
HappySheep said:
really hmmm but my 7800x3d doesn't go above 5050mhz and it has enough headroom i think because it runs pretty cool
Click to expand...
Base clock 4.2Ghz for the 7800X3D. So seeing up to 5050Mhz means CPB is working as expected.
 
Last edited:
LtMatt said:
WRWRSD needs to be 2.
WRWRSC needs to be 1.

SOC voltage drop to 1.25v - 1.3v in BIOS.

Enter DRAM menu scroll to the bottom and look for an option called CMD Mode and set to Buf. If the option does not exist your board doesn't have it I guess.

Bump DRAM voltage to 1.41v and VDDQ to 1.31v and retest.

EDIT - @01001101 See my edit above, you have a couple of timings wrong.
Click to expand...
9p7kUxW.jpg

How's it looking?

I found CMD MODE - In this BIOS it's called ADDR_CMD_MODE.

GdBqBqk.jpg


Is there like a memory guide for dummies? I would love to know what all of these memory names and settings actually mean. It's a whole other language. :cry:
 
01001101 said:
9p7kUxW.jpg

How's it looking?

I found CMD MODE - In this BIOS it's called ADDR_CMD_MODE.

GdBqBqk.jpg


Is there like a memory guide for dummies? I would love to know what all of these memory names and settings actually mean. It's a whole other language. :cry:
Click to expand...
That's the one, disable it. Will need to verify stability with it off. Can always give VDD and VDDQ another bump to 1.42/1.32v as well if needed but it seems like you are not far off from stability currently.

Sadly no, I wish there was. I am still learning myself. It seems like there are some JDEC DDR5 rules which neither AMD or Intel follow correctly from what I understand, so the best values for some of the timings is still an open subject. Lower is not always better as some timings depend on others and can break if too low.
 
LtMatt said:
That's the one, disable it. Will need to verify stability with it off. Can always give VDD and VDDQ another bump to 1.42/1.32v as well if needed but it seems like you are not far off from stability currently.
Click to expand...
Alright. Cool. I've got to pop out for a bit so I'll let Karhu do it's thing for a while and then seeing how things go I'll let it run over night again as suggested.

I also found Power Down and set that to disabled.
LtMatt said:
Sadly no, I wish there was. I am still learning myself. It seems like there are some JDEC DDR5 rules which neither AMD or Intel follow correctly from what I understand, so the best values for some of the timings is still an open subject. Lower is not always better as some timings depend on others and can break if too low.
Click to expand...
It's fascinating. I need to take the time to better understand what's going on.

Thanks again!
 
shalke said:
Quite nice choices. I'd go with it.
Click to expand...
I changed my mind again and I'm back to the NR200P (at least for now) :D

I originally wanted SFF as it's a challenge to build and saves space (so it can sit on my desk). The AP201 is a beautiful case but it's noticeably bigger than the NR200P. I checked the dimensions against my Lian Li O11 and it's not miles apart, which is an issue considering I want SFF. I'm also not fan of the PRIME lettering down the side of the TG version of the AP201 (poor design choice imho). However saying all that, I'm not completely ruling out the AP201. I've ordered the NR200P so I'll make the final decision when it arrives.

I finally found somewhere that had stock of G.Skill Z5 Neo 32GB 6000 CL30 memory - ordered at £154 and it's arriving tomorrow. They have 2 left for anyone else interested.

Now torn between these 2 builds:

NR200P

7800X3D
Noctua NH-U9S
MSI MPG B650I EDGE WIFI
G.Skill Z5 Neo 32GB 6000 CL30
Western Digital Black SN850X 2TB
Gigabyte 7900 XTX Gaming OC
Cooler Master NR200P
Termaltake Toughpower SFX 850W
Noctua B9 Redux 1600RPM PWM 92mm Fan x2 (to replace fans on NH-U9S)
Noctua NF-S12B Redux PWM 1200RPM 120mm Fan x2
CableMod Pro Cable Extension Kit (Carbon)

£2576 ish

May swap the Gigabyte 7900 XTX to the Sapphire Nitro+ or XFX Speedster MERC as some reddit posts indicate these cards do actually fit.

AP201

7800X3D
Noctua NH-U12A
Gigabyte B650M AORUS ELITE AX
G.Skill Z5 Neo 32GB 6000 CL30
Western Digital Black SN850X 2TB
Sapphire Nitro+ 7900 XTX
Asus Prime AP201
Corsair RM850x
Noctua NF-S12B Redux PWM 1200RPM 120mm Fan x4
Noctua NH-HC8 Heatsink Cover for NH-U12A
CableMod Pro Cable Extension Kit (Carbon)

£2567 ish

Near identical builds and near identical cost. AP201 probably offers a bit more flexibility in the future due to supporting mATX boards, bigger GPU's and ATX PSU's (although you can buy an ATX PSU bracket for the NR200P now). However, the AP201 is bigger and I have some niggles with aesthetics. If I manage to fit the Nitro+ or XFX Speedster MERC into the NR200P, performance will be pretty much the same.

Another plus in the column for the NR200P is the modding community - this case even has it's own dedicated sub-reddit.

Hopefully the NR200P arriving tomorrow will make the decision for me.
 
For anyone else not realising and may have missed the discussions so far, if you bought a 7800X3D on launch contact OcUK support for an AMD Rewards coupon code for the new Star Wars game out in 3 days - got mine yesterday :)
 
LtMatt said:
Try putting tCL up to 32 from 30, see if the DIMMs are just a bad bin and rerun the test.
Click to expand...
Just installed my new 7950x3d. Put my Ram timings back in, checked aida and latency is up to 60. Was getting around 56 with my 7700x. Is there more latency with the 3d chips ?
 
Last edited:
Just completed building my first gaming PC earlier today. I have a 7800X3D. Looking at other people’s idle temps, mine seem unusually low. I’m slightly worried that I might have done something wrong. I am idling at 25c.
 
Name said:
I'm idling at 38-40c with an AIO. Totally overkill cooling but it looks cool.
Click to expand...
AIOs look really cool. I just heard that they could be noisy. Your temps seem fine, no? That seems to be roughly what most people are reporting. I’m using a Noctua air cooler in a Phanteks case with three intake fans and an exhaust, no undervolting. Not sure why I’m idling 10c-15c lower than others. Sensor problem?
 
Last edited:
doobyscoo said:
AIOs look really cool. I just heard that they could be noisy. Your temps seem fine, no? That seems to be roughly what most people are reporting. I’m using a Noctua air cooler in a Phanteks case with three intake fans and an exhaust, no undervolting. Not sure why I’m idling 10c-15c lower than others. Sensor problem?
Click to expand...
Might be down to what he has installed/running, but mine are similarly low on an aircooler (don't think the cooler is the bit making the difference more likely cpu usage tbh).

o7Ua6hJ.png
 
Last edited:
You must log in or register to reply here.
Back
Top Bottom