So, I got this card a while ago and was blown away with its performance and even more performance when i built another rig but kept the GPU. Now Prices have come way way down and I wanted (for fun) to add another card. I already added a prior nvidia series card for dedicated physx processing and was kind of impressed with the numbers but I wanted to go SLI. I have limited time on SLI rigs. I built one for Battlefield2 A very special build as a new buss was out. The dreded AGP buss had migrated to the newer PCI X buss (AMD Sandi on EPOX MoBo and 2 PCI X GTX 6800 Nvidia GPUs in SLI) Built for BF2 - it ran ran the game flawlessly at max settings  Few builds later I built another SLI rig with the GTX 460 1024 signature cards. But this is where i started running into trouble. I thought the cards were identical but one had a different BIOS. Needless to say, it worked and didnt work and worked and.... 
My latest and current build I focused on storage and SSD performance running M.2 x2 raid boot and 2 SSD raid storage with evga geforce gtx 970 04G-P4-2974-B6 single. 
Now I want to  have some fun and grab a second identical card to run in SLI. I have read that stuff has changed and they do n ot have to be super exact but.... can anyone help me select a card that will perform well with my evga geforce gtx 970 04G-P4-2974-B6? the one problem I am having is that I can not find this exact card no matter where I look. Its this manufacturing sequence and the "b6"  ANy help would be apreciated. I am also interested in water blocks for the 970. I have a water block for a titan X that is useless to me but I know it will fit another card other than the titan x

If you happen to find another EVGA GTX 970 on the market check with EVGA technical support before buying it to make sure it will SLI with your existing card

ok I will start my hunt. And believe me... search for your selves. I payed $600. for this card when it came out. I was super blown away with the used prices $150.!!!

maybe getting time a guy needs to finance like a car  . low interest  99$ down 99$ a month for the next 99 years .  anyone can afford new hardware  !! buy now and save !! 
 
or blame prez trump on his tariffs.  or move manufacturing to mexico and our new trade agreement or just manufacture them here in the usa  and pay a guy what he is worth  to put food on the table
 
cheap china junk aint so cheap anymore   they may start loosing jobs to the next 3ed world cheap labor contrary  like we here in the US did ?  

best follow that evga sli 970 card list posted above    on the model #  kr br don't matter thats the suffix that states if is first quality / new card or referb or recertified  , ect....   04G-P4-2974-''KR'' = new with full 3 year P/N: 04G-P4-2974-''RX''  b-stock 1 year  for example    look in the warrantee page and it will show what each means 
 
now if I recall I thought I seen guys with them odd ball evga 970's  that don't just sli with anything did not even sli with another brand card well if at all and I think it ended up may of had to use that different SLI software  as posted above to make them ??
 
not 100% on that its been so long now.  , but maybe one of them better safe then sorry if it don't things and your out ?
 
RX cards
https://www.evga.com/products/productlist.aspx?type=8&family=GeForce+900+Series+Family
 
 
kR new with full 3 year
https://www.evga.com/products/product.aspx?pn=06G-P4-4991-KR
 
that B6 as yours  I don't guess I ever seen before unless it a non USA card ?
 
this part of the cards SN # is what to match ''04G-P4-2974 ''   as like the evga guy said in his way