Quote from: solominer247 on May 19, 2019, 05:34:40 PM

Quote from: joseph32 on May 19, 2019, 12:57:19 AM

Wouldn't four double PCIe cables mean you can connect four GPUs? Then use four of the remaining single ones for GPU 5 and 6?

Sorry, I'm getting confused with the cables, apologies.

I've managed to connect 2x Radeon VII with 4 x 8-pin pcie cable.

Now I have 5 of these : https://images.evga.com/products/gallery/100-CK-1300-B9_XL_4.jpg (I think its 6+2pin + 6pin connector)

Yeah, the 1600 comes with all 6+2s, and 6/6+2s. Using the 6/6+2s on my vega 64s, I run the 6 to the riser, then split the 6+2 using this:

https://www.amazon.com/gp/aw/d/B07611QXG4?psc=1&ref=ppx_pop_mob_b_asin_title

Just make sure you get the pcie splitter version (and double check the wiring when you get them) - there are similar products which are wired for the cpu cables, and will cause problems.

One thing to note - while I’ve been running these for 1.5 yrs no problem, I don’t run my Vegas over 200w (I also have a seasonic PSU that suggests not running more than 225w through a single 6/6+2). You’ll likely be pulling more power w/ the vii, but technically the EVGA cables should be able to handle it. The pins should be rated @ 11a, (or 8a at the very least), while I believe the cabling is 16g/13a (or again 18g/10a at least), which means a single pcie cable should be able to carry min 3 hots x 12v x 8a = 288w, or spec 3 x 12 x 11a = 396w. Obv the adapters are an unknown quality - but you can at least check the wire gauge, then monitor wire/connector temp - slightly warm to the touch is fine, hot - not so much.

If you want something more reputable than these no-name Chinese adapters, I think you can get 1x8-2x8 splits from cablemod, but be prepared to pay for it.

Quote from: solominer247 on May 19, 2019, 11:55:42 PM

Quote from: joseph32 on May 19, 2019, 10:57:51 PM

Yes, use 2 of them. Each cable connects one slot from PSU into one slot of your GPU. The remaining 6 pin on that cable just ignore. If you dont have enough cables, just buy some of these cable mods for EVGA PSU's.

If you need more help, just open another thread especially for that problem. Its not really related to hashrate & co Wink

Sweet! I appreciate the support mate.

Finally, I have managed to get 2x Radeon VII working, and yes it's stable on Nicehash.

I'm using the following settings ;
Core 950 mV, Power limit -10%, Core Clock 1750 MHz, Mem 1100 MHz, Fan Speed auto.

DaggerHashimoto @ 0.179 GH/s ; 89 Mh/s & 89 Mh/s
GPU temperatures ; 103 degrees & 105 degress

The only worrying thing now is the temperature. I've read on this thread from post temp hits 89-91. But mine they are all 100+ , should I be worried or is that normal?

I’m assuming that’s junction temp - and yes, that’s pretty hot. I believe you’ll start throttling just over 110c.

My single vii runs at mid-70s junction around 70-80% fan, in a pretty tight atx enclosure w/ only middling exhaust, along w/ a 590 and a 8700k. Obv your second vii is putting out a bit more heat than my 590, but you’re also open-air, so it’s prob a wash. The main prob is your clocks/voltages. As I mentioned earlier - 90mh/s is pretty inefficient (meaning a lot of extra heat as well)