u/Substantial_Run5435

I recently picked up an IF Link bridge (A2666) for my dual W6900X MPX modules; however, when installed, my display is flickering intermittently and I had a recent crash related to watchdogd and WindowServer which seem to be GPU related. I tried resetting SMC, resetting NVRAM, and reseating the IF Link bridge but the flickering persisted.

I removed the bridge and the computer appears to be working normally. Has anyone else run into this issue? Could it be a bad bridge? The bridge does work, I see Infinity Fabric Link Enabled in System Report and the LLM tool I'm using works with it (I get faster prompt processing when it's installed and I enable IF Link in the LLM software, so I know it's working).

Finally playing around with ToshLLM while trying to narrow down which MPX GPU(s) to keep. I am completely new to LLMs and local AI and do not have a tech background, so the learning curve has been a bit steep.

I have 2x W6900X, W6800X Duo, and 2x Vega II Duo on hand. I have the IF Link for the W6900X. Obviously the W6900X limits me to 64GB across 2 GPUs. If I end up keeping the W6800X Duo I will probably look for a second and an IF Link Bridge.

So far I've only tested the W6900X(s) (single GPU and pair, with/without IF Link bridge). So far I'm not seeing any difference whatsoever with IF Link on my W6900X pair. Getting the same exact ts with llama 3.3 70B Q5_K_S with the IF Link bridge installed/enabled as with it not installed.

Top 2 results are with IF Link disabled in menu. Identical results with both layers and tensors.

This was my fastest benchmark. Qwen3.6 35B-A3B UD-Q4_K_S got 69ts. Qwen3.6 35B-A3B UD-Q8_K_XL was a little slower with 61ts.

This size model seemed to perform better splitting layers vs tensors. I was seeing about 40ts with tensor split enabled.

I have a bunch of MPX GPUs and want to sell most of them. I have 2x Vega II Duo, 2x W6900X (with IF bridge), and 1x W6800X Duo. I’m a bit torn because all have their plusses and minuses. The Vega II Duos get me 128GB of HBM2 but they’re an older architecture and very power hungry. the W6900X pair only gets me 64GB of VRAM but they’re the fastest individual GPUs made for the Mac Pro. The W6800X Duo seems like the best option but I’d need to find another one and an IF bridge.

Unfortunately, I don’t really have time to test the GPUs extensively and I overextended myself a bit acquiring the machines they came out of. I was initially planning to keep 2 2019 Mac Pros but am now set on downsizing to just 1 machine and 1-2 GPUs.

I want to start taking my toddler for little rides and we own one of these already for travel. We also have 2 Nuna Rava car seats for our daily drivers so I really don’t want to have to buy a fourth car seat for one kid 😅

I’m an old timer who stepped away from the hobby in 2018. Have had dozens of keyboards (including some top shelf stuff like OTD, Duck, LZ, FMJ, etc) and basically everything under the sun leycap wise from that era (OG cherry dye subs, OG doubleshots, GMK, BSP, Cherry POMs, GMK, every Signature Plastic profile).

Before I left the hobby GMK was working on Cherry-profile PBT keycaps but it seems this never materialized. Other Cherry-profile PBT caps seem to have lower quality dye sublimation and are usually a touch thinner than Cherry ones; however the big issue was always warping/sink marks that made the caps look misaligned. Has anyone managed to make a better quality PBT keycap in the last 7-8 years?

I’ve been checking into the hobby again lately and have seen so many developments that were unheard of 12-15 years ago.

Purchased an item located in the EU but originally made in West Germany, which ceased to exist in 1990 before the EU was founded.

The only other item I've imported was shipped from the UK and made in Japan, but the tariffs were calculated for the UK ¯\_(ツ)_/¯

Hi, I made a post recently looking for advice running local LLMs on my 2019 Mac Pro. At the time, I was split on what GPUs to use, but I happened upon a really good deal for a pair of Vega II Duo GPUs (4x Vega II 32GB GPUs for 128GB total HBM2 with 1Tb/s bandwidth each). I currently have the small infinity fabric (IF) jumpers on them (connects the two GPUs inside each module) but don't have the IF bridge to connect the two modules together, though from what I'm reading I might want to skip the IF link stuff all together as support for it is spotty.

I'm looking for advice on the following:

• What OS would be best? I've seen several people recommend Ubuntu Server or RHEL. I would also be fine with running Windows 10/11. Am more concerned with what will be easier to live with and stable. From what I understand, MacOS is not really an option for this on an Intel-based machine if I want to use the GPUs.
• What stack/models and parameter size(s) would you recommend that would be well suited to my spec. I have a lot of VRAM so I believe I should be able to run a fairly large model. AFAIK CPU and RAM aren't as relevant, but I could have a 12 or 16 core Xeon W and up to 192GB of 6-channel DDR4 ECC RAM.
  • My primary use cases are research, text analysis, document generation, not so much image/video generation.
  • I would like to at least poke around and "vibe coding". I have no coding background whatsoever. This is more a curiosity than anything else.
• I am considering purchasing a second W6800X to use two of those instead of the 2x Vega II Duos. That would be half the VRAM (64GB total) and lower memory bandwidth, but a newer architecture and perhaps better support (and half the power consumption). Would that be a better route to take hardware wise?

Hey everyone, I have a single 8GB stick of OEM Micron DDR4 that causes my Mac Pro to not boot. I've tried it in a couple different slots/configurations (4 sticks, 6 sticks, etc) but haven't tried it as a single stick or in a pair yet. When attempting to boot I get the blinking amber LED for memory failure.

Is there anything else I can do to troubleshoot that stick? Or is it just toast if the computer won't boot with it? It looks perfect physically but was DOA when I received it. I know you can check the memory status in the system information, but my computer doesn't boot with that stick installed, so that seems kind of pointless.

I know these are both older GPUs at this point and that the W6800X generally outperforms the Vega II, but I'm wondering if there are any use cases where a Vega II is better (maybe due to the higher memory bandwidth?)

I ended up with both of these GPUs and am planning to keep one alongside my RX 6900 XT.