M.2 + GPU questions

[Mero_de]

Hello guys,

i have an Asus B450 TUF Gamin Motherboard and a gtx 1660 TI with Ryzen 5 2600

i want to add an M.2 SSD but im not sure if this will effect the PCIE or the GPU performance.

i have some words in mind and have no idea what they means, could you please tell me wtf do i want to know ? because i dont know what i want.

CPU lanes? PCIe 3.0 x4? PCIe 3.0 x8 or x16 ?

would the M.2 use the PCIe lanes from the chipset instead of the ones allocated for GPU ? huh ? i dont know if this question make sense but ill just ask cuz idk wtf this question means.

 

May be a dumb question, but I've reached the limit of what I can decipher from the mobo manual.
Don't want to go messing up my GPU performance when I could just use a SATA SSD, but would like the faster pcie speed if possible...
Thanks!

 

another question, would it matter if i put the GPU on the second slot or should i use the main slot ? what is the difference ? does this effect the m.2 somehow?  you know? those stuiped words x16 x8 x4 or whatever?

 

i still have 0 idea how to discribe what i want but i hope u get it, and sorry for the confused stuiped English.

 

please awnser me with simple words which a noob, beginner, donkey, bot would understand. 

Thanks in advance

 

[sphbecker]

Short answer, no, you will be fine.

 

Long answer, on the B450 chipset the PCIe 16x slot has direct lanes to the CPU, they don't go through the chipset, so nothing else you connect will impact its performance.

AM4 Ryzen CPUs have 24 PCIe lanes. They are broken up as follows.

16 - GPU ( A470 boards have an options to split this 8 and 8 for SLI )

4 - M.2 slot for SSD

4 - chipset (basically everything else)

 

Anything else you connect to the board such as networks cards, storage controllers, ect. will share those last 4 lanes, but the first 20 I mentioned are dedicated.

 

Hope that helps.

[Mero_de]

2 minutes ago, sphbecker said:

Short answer, no, you will be fine.

 

Long answer, on the B450 chipset the PCIe 16x slot has direct lanes to the CPU, they don't go through the chipset, so nothing else you connect will impact its performance.

AM4 Ryzen CPUs have 24 PCIe lanes. They are broken up as follows.

16 - GPU (SLI boards have an options to split this 8 and 8 )

4 - M.2 slot for SSD

4 - chipset (basically everything else)

 

Anything else you connect to the board such as networks cards, storage controllers, ect. will share those last 4 lanes, but the first 20 I mentioned are dedicated.

 

Hope that helps.

thanks for that, very helpfull.

so i think it also doesnt matter if i put the GPU on the sec slot cuz each GPU slot has 8 lanes right?

 

[sphbecker]

1 minute ago, Mero_de said:

thanks for that, very helpfull.

so i think it also doesnt matter if i put the GPU on the sec slot cuz each GPU slot has 8 lanes right?

 

I am sorry I did not address that part of your question. On your board you need to keep the GPU in the top slot. That is the only slot with direct CPU access. The 2nd slot is wired into the chipset and only gets access to the shared 4 lanes. I realized after posting that my comment about SLI boards only applies to A470, not B450.

[sphbecker]

This is from the motherboard page. It doesn't exactly make sense until you realize that what they mean by "chipset" is the shared 4 lanes. Once you know that, then you see that only the main 16x slot should be used for a GPU. The other 16x slot can be used for something like a storage controller or network card, that might have a 16x interface, but will work fine with just 4x of bandwidth.

 

AMD Ryzen™ 2nd Generation/ Ryzen™ 1st Generation Processors
1 x PCIe 3.0/2.0 x16 (x16 mode)
AMD Ryzen™ with Radeon™ Vega Graphics Processor
1 x PCIe 3.0/2.0 x16 (x8 mode)
AMD B450 chipset
1 x PCIe 2.0 x16 (max at x4 mode)
3 x PCIe 2.0 x1

 

It is also worth noting that the chipset connected slots are only PCIe 2.0. So not only would the GPU be limited to 4x, but it is 4x at halfspeed! Major bottleneck!

[Mero_de]

3 minutes ago, sphbecker said:

This is from the motherboard page. It doesn't exactly make sense until you realize that what they mean by "chipset" is the shared 4 lanes. Once you know that, then you see that only the main 16x slot should be used for a GPU. The other 16x slot can be used for something like a storage controller or network card, that might have a 16x interface, but will work fine with just 4x of bandwidth.

 

AMD Ryzen™ 2nd Generation/ Ryzen™ 1st Generation Processors
1 x PCIe 3.0/2.0 x16 (x16 mode)
AMD Ryzen™ with Radeon™ Vega Graphics Processor
1 x PCIe 3.0/2.0 x16 (x8 mode)
AMD B450 chipset
1 x PCIe 2.0 x16 (max at x4 mode)
3 x PCIe 2.0 x1

 

It is also worth noting that the chipset connected slots are only PCIe 2.0. So not only would the GPU be limited to 4x, but it is 4x at halfspeed! Major bottleneck!

good to know! im kinda pissed now because my new GPU is so fat that it touch the CPU Cooler and thats the reason why i wanted to put it down in the sec slot.. but yea it looks like i dont have an option i will just let it in the first one altough it is reaching 83° under load and hours of intensive gaming..

 

i will get a new case in 2 days for better cooling.

 

[Mero_de]

i have the biggest cpu cooler from noctua and the fatest 1660 TI that anyone could have.. and a MICRO ATX BOARD

[sphbecker]

GPU temps of 83 are not alarming. You might be missing out on a small amount of boosts, but it would be minor. If you are getting a new case, make sure you have a decent front and rear fan so you get good airflow across the GPU card. The card touching the CPU cooler isn't ideal, but not the huge deal if their isn't pressure.

 

Unless you are doing an insane overclock, that CPU cooler sounds like overkill for your 2600, but I doubt you want to spend money replacing it. If you really need to, you can probably find some really cheap Wraith Prisms on eBay (that is the bigger stock cooler that comes with the higher end AMD chips).

[Mero_de]

14 minutes ago, sphbecker said:

GPU temps of 83 are not alarming. You might be missing out on a small amount of boosts, but it would be minor. If you are getting a new case, make sure you have a decent front and rear fan so you get good airflow across the GPU card. The card touching the CPU cooler isn't ideal, but not the huge deal if their isn't pressure.

 

Unless you are doing an insane overclock, that CPU cooler sounds like overkill for your 2600, but I doubt you want to spend money replacing it. If you really need to, you can probably find some really cheap Wraith Prisms on eBay (that is the bigger stock cooler that comes with the higher end AMD chips).

The idle temp of the cpu is 25 and the gpu 30.

Im not doing any overclocking for cpu or gpu.

 

Cpu under full load and long hours doesn't go above 52 but the gpu fan goes nuts and reach 83°.

 

Good to know that it's not alarming,  i have a small micro atx case 

 

https://www.caseking.de/en/bitfenix-prodigy-m-micro-atx-gehaeuse-schwarz-gebf-107.html

 

So yeah i think the new one will make a difference 

 

https://www.amazon.de/gp/aw/d/B07DHQ15LG?ref=ppx_pt2_mob_b_prod_image

 

I will see how it goes with the new case, if i didnt notice a big difference i will just get a new smaller amd cooler

[Mero_de]

@SP SpecTreThanks very much for sharing informations.

Very helpful and informative.