Mid-Range Hshcracking Rig - Relevance of PCIe Bandwidth,GDDR-Type, VRAM, Blower-Fan e
#1
Hi there,

I'd like to build a mid-range Hashcracking Rack, about 2.000 bugs. Focus is a good price-performance ratio.
PS: I am aware that RTX 5000 is about to be released and the gpu prices are rather high right now as Nvidia stopped production of rtc 4.000 before the rtx 5.000 are available. However for tax reasons I have to buy it in this year.

1. I know it is recommended to use blower-style cards, but those are hard to find in the rtx 4 generation.
I think 2-3 GPUs in a 4U Rack should be fine without blower-style, aren't they?

So I consider 2 RTX 4070 GPU and a Ryzen 5600G such that there is an independent iGPU for the OS. I consider picking a board with 3 x16 slots for later Upgrade.

2. How relevant is the electrical PCIe bandwith for Hashcracking?
There are boards ~ 200 bugs that have either (in () is the electrical layout of the slots)
2x PCIe 4.0 x16 (1x x16, 1x x8)
and 1x PCIe 3.0 x16 (x4)

or
3x PCIe 4.0 x16 (1x x16, 1x x4, 1x x2),

and there are boards at ~ 500 bugs
3x PCIe 4.0 x16 (1x x16, 1x x8, 1x x4)
or 3x PCIe 4.0 x16 (1x x16, 2x x8),

If Hashcracking works fine with 3.0 x4 or even 4.0 x2, I'd definitely pick a 3 slot board. If x8 is required, I may rather pick a board with 2 slots only.

3. 4070 do have either GDDR6 or GDDR6X VRAM. For Gaming I read the X is about 3% faster, but is it relevant for Hashcracking, too?

4. I read that RAM should be twice the sum of VRAM for Hashcracking. According to this, 2x 2x12GB=48GB would be the recommendation, so I'd use 2x DDR-3200 32GB for dual Channel (128GB in 4 Slots is the Max of all the boards anyway). Or is overclocking of RAM worth the effort/additional costs for hashcracking?

That would be:
2x 4070: ~1100
Board: ~200
64 GB ECC-RAM ~ 150
5600G ~ 100
PSU 1000W 80+ Platinum: ~150 (maybe FSP VITA GM 1000W ATX 3.1)
Case: Chenbro RM41300G ~ 200 (because it has 8 PCIe slots)
= ~1900
What do you think? Anything I missed that may be an issue?

Thanks a lot, greatly appreciated.
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Messages In This Thread
Mid-Range Hshcracking Rig - Relevance of PCIe Bandwidth,GDDR-Type, VRAM, Blower-Fan e - by fsdafsadfsdsdaf - 12-06-2024, 03:36 PM