My experience with Optimus has been good. Every email I sent. They replied the next day.

AtozGlue
My experience with Optimus has been good. Every email I sent. They replied the next day.

same for me. i've probably purchased 2ish thousand dollars worth of water blocks, fittings, and loop parts from them directly. New and blemish/b stock. Sometimes I made errors and purchased the wrong item(s) and needed to return or exchange things. I never waited more than 1 business day for a reply and every time they replied it was to let me know my refund/exchange was processed and on its way. So while I get that others have had bad experiences with them, I can't speak to that, personally.
 
This includes the 2 kpe blocks I pre-ordered the moment they became available. Like many others, I was frustrated by the cryptic production process/timeline and bailed after several weeks and a couple of disappointing delays. I'm not fanboy but thought i'd offer my experience for contrast.
 
Will I buy their blocks in the future? Maybe. For me, the insane price of the kpe blocks didn't sit well with me when the delays and excuses started. I know things happen, but that's a *very* premium price for a product that yes, probably wasn't ready for production when they took our money. 
 
If i'm guessing, this is a very small operation that lacks a real leadership structure and would do well to find a buyer to improve their processes. Maybe they're doing this or have done it already? Time will tell

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ShawnB420
😂😂😂 @ fanboy that’s funny.

You seem to be the only one blindly defending Optimus multiple times in this thread.  Nobody but an Optimus fanboy or employee would do that.

You might want to go reread that then.

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Optimus has a new poll on twitter about its 4090 blocks and preorders:
https://twitter.com/Optimus_WC/status/1580346503175974913
A few comments about the RTX 3000 blocks are in there.

"Our 4090 block is inbound for November..."    I'll take this with 10 truck loads of salt. I believe Optimus' statement when it happens.

Optimus admits to their mistakes with the KP 3090 blocks.
 

 
https://www.overclock.net/threads/optimus-waterblock.1733810/post-29047599
 

redteamgo
I don’t know how they could say those problems are “early” batches when the entire delivery was 7 months behind. They screwed up big time on communication, delivery and now ownership. Spin insults everyone’s intelligence.

Well they have new blocks to sell, gotta spin...
 
Will be interesting to see how it pans out with their 4090 blocks.

Not sure I'd go back for Cerakote again.  Not having a option for a nickel finish would make me look at other blocks should I get a 4090 in the future.  I have my kingpin running and while the temps have been good I'm not looking forward to taking apart the block and possibly have the cerakote flake off.  Since I'm going to start playing DCS in the near future I am looking like I will be looking to pick up a 4090 or possibly even a 7950XT depending on how that comes out.  The blocks being available for each GPU would have a huge impact on what GPU on decide on in the end.  Would love to see EVGA come back to the GPU market when the time comes for a GPU upgrade.  
 
Still can't figure out why the KP block didn't extend all the way to the display port area on the block though.  While it may have added a bit more weight to the block, it would have been so much less prone to bending the pcb in a horizontal position.  
 
The delays were a whole different issue, but you can only hope that they are learning to be better.  
 
Still love the original nickel block I ordered for my 3090.  
 
Optimus has the potential to be a great niche company and I hope they are getting better at meeting their timelines they share and improve their communications especially related to delays and launches.  

if I saw anything in my system, I would try a clear fuel filter, might try that when I rebuild it next year

I've seen one recently go on sale on ebay but the seller wanted over the cost of the block since it is not made anymore.  Bykski  makes a block for the 3090 Kingpin with active rear cooling.  That would be your only other option other than the hydrocopper version if you can find one.  I would give the bykski version a shot if you need a block.  It costs a whole lot less than the Optimus does at around 200 bucks.  
 
Hope this helps.  

Would like to ask whoever bought the cold head if they want to sell it, I would love to buy it