Are there any CPU only projects that OcUK is particularly active on?
Depends what you mean by active ?
If it's the projects with a large number of our team working on at the same time then they tend to be the ones that get promoted here when we have signed up to a team challenge or in the case of Einstein when someone says 'Oi, let's do this' !
Best guess at the cpu only project most worked on all the time by our team would be World Community Grid (WCG).
There are several stats pages but I use the Free-DC ones.
Here is the OcUK team page:
http://stats.free-dc.org/stats.php?page=teambycpid&team=OcUK+-+Overclockers+UK&sort=score#
It lists all our Boinc projects but we also participate in some non-Boinc projects but you need to click on the + next to 'Nonboinc projects' (top left of page) to get the list of projects and then find us within those stats.
For the Boinc projects you can click on the text in blue on the page.
1) For example you can click on the number of users to list the current and past members.
2) You can click on a project's score and it will take you to that project's page for our team so you can see how many have/are contributing.
3) You can click on the end column 'Project Rank' to sort our projects into where we rank in the world, from 1st to 543rd. Currently WCG ranks as our 15th highest scoring Boinc project but is 99th out of the 101 Boinc projects we have contributed to with regards to team ranking. Some projects, like WCG, are very popular and have lots of teams and lots of competition, others less so.
Note that the list does not indicate which are active and which have long since stopped.
To know if a project is cpu only you need to visit the project's application page where it will tell you what applications it has and will therefore indicate if it runs on gpus as well.
This page lists our current position in The Vault:
http://roarnet.nl/iis/dpc/dcVaultStats.aspx?team=OcUK%20-%20Overclockers%20UK
It also shows which are: Boinc projects, and run on CPU, AMD, and/or nVidia.
So it shows DENIS is Boinc and also runs on cpu (but there are no AMD or nVidia icons).
It does not show if they have Windows, linux, Mac versions though.
So this list can be used for some of the current projects to see if they are cpu only.
If you have a preference for biological/medical, mathematical, space, physics and Hadron Colliders and want guidance let me know and I'll try and point you in the right direction(s)