Advice please on DDR5 RAM 48GB (2x24GB) 8000MT/s CL40-48-48-128 1.30V

rapid64k

rapid64k

rapid64k

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Hi Guys,

Been locked out of the forums for a while was not getting my verification.

I am doing a new build using a Asus Strix X870E-E wifi Gaming board using the Asus QVC list - which was late at night so I may have screwed up I selected two sticks of DDR5 RAM 48GB (2x24GB) 8000MT/s CL40-48-48-128 1.30V (F5-8000J4048E24GX2-TZ5RK).

it's on its way to me as we speak but I checked on the G Skill web site and it said that it is not supported on my Mother board while Asus says check the Vendor list.

Will these two strix work with my new build Mother board?

Cheers
 
I saw somewhere that if you change a setting in the AI Tweaker/UCLK DIV1 MODE to UCLK=MEMCLK/2 may help with the speed. Has anyone tried this setting?
 
The sticks are "single rank" so you have a good chance of hitting 8,000; subject to the CPU IMC and the motherboard. You have the Hero which should be fine. The quality of the CPU IMC is silicon lottery.

Given your CPU has 2 CCD, there is a benefit in hitting 8,000. Take a look at the CPU forums, in particular the 9950X3D thread, which includes a lot of posts about overclocking DDR5 and hitting 8,000
 
WARburton said:
the ram will obviously work but at 8000mhz... that's a different question.
what CPU do you have?
Click to expand...
9950X3D
sativa said:
The sticks are "single rank" so you have a good chance of hitting 8,000; subject to the CPU IMC and the motherboard. You have the Hero which should be fine. The quality of the CPU IMC is silicon lottery.

Given your CPU has 2 CCD, there is a benefit in hitting 8,000. Take a look at the CPU forums, in particular the 9950X3D thread, which includes a lot of posts about overclocking DDR5 and hitting 8,000
Click to expand...
The Hero was my old build. I am starting a new build using a Strix X890E-E
 
rapid64k said:
9950X3D
Click to expand...

so in that case everything passed 6400mhz is going to be hard, and the IF is going to run unmatched and there for it will run slower even thought the ram is running faster
dont waste your money on 8000mhz ram, 6400mhz is about the max, you will get some to go passed that but running unmatched will have a negative affect

you could however slow the ram down to whatever your IF will run at say 6400mhz, then sort out the disgusting CL timings to something like 30/36/36/78, i mean CL40/48/48/128 is disgusting

​

 
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Hi Guys,

Memory turned up early been building all day yesterday. turned on first Boot managed to get the DDR Ram speed to 7000mhz think i'll stick here for now.

Apricate all your input.

Please ignore my sig that was the old build.
 
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What.....8000 is way better than 6400, not only do you get the latency, you also get the bandwith increase, and its easy to hit 8000 on Ryzen, just make sure you set UCLK=MCLK/2, I recently sold this kit as I wanted to play with the new G.Skill CL26 6000 A-Die kit, I didnt need 48gb, so went back to 32gb, if you dont want to push the voltages I was, then just knock it to CL36, if you're happy to push those voltages, you may want to put a ram cooler or a fan over the top of them, and make sure you test for stability.

Old Kit.
tEs9GlS.jpeg


New Kit, RAM testing is already complete, im currently using Memtest Pro to test the curve optimizer, full load, low power, high frequency on the CPU, already completed Y-Cruncher, OCCT AVX2 all core, OCCT SSE ST and All Core, CB R23, CB R24.

on2UWv1.jpeg
 
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Jamin280672 said:
What.....8000 is way better than 6400, not only do you get the latency, you also get the bandwith increase, and its easy to hit 8000 on Ryzen, just make sure you set UCLK=MCLK/2, I recently sold this kit as I wanted to play with the new G.Skill CL26 6000 A-Die kit, I didnt need 48gb, so went back to 32gb, if you dont want to push the voltages I was, then just knock it to CL36, if you're happy to push those voltages, you may want to put a ram cooler or a fan over the top of them, and make sure you test for stability.

Old Kit.
Click to expand...

i was always let to believe in game running mem clock and IF unmatched had a real world negative affect. not a memory bench mark
should memory and IF not be at 1:1 ratio for best again real world performance?

i have my 7600mhz memory running at 6000mhz with tighter timings.
i may give full speed a go and see how i get on
 
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mclk-ratio.png


The table above shows the relationship between MCLK and UCLK at various DDR speeds. As you can see, once you go above DDR5-6000, the memory controller has to run at MCLK of over 3000 MHz, which is getting close to its maximum frequency limits.

When the 1:2 mode is active, the memory runs at twice the frequency of the memory controller, which means the memory controller can run at lower speeds, which it can handle better. This lets you achieve higher memory speeds without compromising the stability of the memory controller. While memory bandwidth is increased, additional latency is introduced, because the memory controller has to manage the data flow without being able to synchronize perfectly with the memory clock.
Click to expand...

See here

OP, I'd test your current settings with games and so on to see what the performance is like and then save that BIOS settings profile and try 1:1:1 (3000:3000:6000) and see which get's you a net benefit in terms of actual performance IRL.

AMD is latency sensitive so you could be better off with 1:1:1 depending on what you're using your system for.
 
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Jamin280672 said:
just make sure you set UCLK=MCLK/2
Click to expand...

so looking at what you have done here, with 7200mhz ram(i thought it was 7600..) would set the IF at 1800mhz and not the optimal setting of 2000 to 2200
would this not have a bigger negative affect on the system than just running 6000mhz ram at 1:1 (IF @ 2000mhz)
 
WARburton said:
i was always let to believe in game running mem clock and IF unmatched had a real world negative affect. not a memory bench mark
should memory and IF not be at 1:1 ratio for best again real world performance?

i have my 7600mhz memory running at 6000mhz with tighter timings.
i may give full speed a go and see how i get on
Click to expand...

IF on ryzen never runs at 1:1, the usual is 3:3:2 so 3000 UCLK, 3000 MCLK (DDR6000), FCLK 2000, but just run IF as fast as it will go, its completely desynchronized on Ryzen 7000 and 9000.

Or you can class it as 1:1:Auto (UCLK:MCLK WHICH IS YOUR RAM SPEED, AUTO FCLK/IF)
 
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