Pci lanes for Fatality X470 itx

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senpaiouji

Jun 22, 2018
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Hello, I'm interested in purchasing an ASRock X470 itx mobo for my new PC build. I haven't upgraded in 10 years and I'm really excited! Unfortunately, I'm also a bit behind in all the new lingo. I'm planning on adding a 1080GTX along with an M.2 SSD for my boot drive, a 2.5inch SSD for other applications, and a 2.5inch normal hard drive for media and stuff.

However it is to my understanding that there are a limited number of Pci lanes to work with. But I'm not sure if the SSDs share lanes with the GPU or on the chipset and what not. Basically I want to know that in this configuration would my performance falter in anyway? I really would hate to lose GPU performance or SSD performance because I overlooked something. Ah if it matters, the Cpu I'm using is a Ryzen 2600X. Thank you very much for your help!
 
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CountMike

CountMike

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Oct 31, 2015
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Depends on CPU - MB combination but you have to be concerned only with multiple GPUs and multiple PCIe devices. On combination like yours, you have PCIe lanes to spare and not to worry about it.
Otherwise, that Ryzen has 32 internal but 24 are supported from chipset.
With that combination you need only 16 for PCIe slot (for GPU) and 4 lanes are free (coming from CPU) for M.2 drive.
 
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senpaiouji

Jun 22, 2018
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Honestly I had to do a lot of research on this and one thing I would say is look at the manual online first and see if the answer is there. If not, it is highly likely that one can run at full speed but if you put a GPU in there, the other one will just be limited to SATA speeds. But again, I'm no expert, just what I have seen from various Mobos of this type.
 
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CountMike

CountMike

Titan
Oct 31, 2015
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Same MB that I have.
Top M.2 socket (one covered by heat defuser) runs at full NVME x4 mode no matter what.
Bottom one:
The M.2_2 socket shares PCIe clock with PCIe x1_1. When PCIe x1_1 or PCIe
x1_3 is occupied, the M.2_2 socket can only support SATA mode.

In either case, bottom M.2 doesn't "deserve" very fast SSD because it will be slower than top one anyway.


 
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MissJessika

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Jan 6, 2017
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Thanks guys.
So I could even save some money by just buying the 970 Evo 250GB M.2-2280 for the OS/Boot Drive and maybe use my old and current (3 year old) 850 EVO-Series 500GB 2.5" as my Data/Game drive.
I'll just format it for a fresh start on new build.

Or should I get a second 850 EVO-Series 1TB 2.5" and sell the older one? Not sure I need all that space since when I game I install as needed and when
I don't play certain Games I remove them.
I am however going to start Streaming. That is the main other difference with my selection.

So for these last 3 yrs I had two 2.5" drives...250GB and 500GB and they served my needs. Thoughts?
 
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