What EBS performance gains can I expect moving non-x86 (sun?) to x86?

Hi,
I was hoping some of you would please share any general performance gains you encountered by moving your EBS from non-x86 to x86. I'm familiar with the benchmarks from tpc.org and spec.org. The users however measure performance on how long it takes for a request to complete. For example, when we moved from our EBS from a two node sun E3500 (4*450 sparc II 8GB memory) to a two node v440 (4*1.28ghz sparc IIIi 8GB memory), performance doubled accross the board with a three year pay back.
I am trying to 'guesstimate' what performance increase we might encounter, if any, moving from sun sparc to x86. We'll be doing our first dev/test migration the first half of '08, but I thought I'd get a reading from all of you about what to expect.
Right now we're planning on going with a single-node, 6 cpu dual core 3Ghz x86, 16GB ram. The storage is external RAID 10. We process approximately 1000 payroll checks bi-weekly. Our 'Payroll Process' takes 30min to complete. Similarly, 'Deposit Advice' takes about 30min to complete. Our EBS database is a tiny 200GB, we have a mere 80 concurrent users, and we run HRMS, PAY, PA, GL, FA, AP, AR, PO, OTL, Discoverer.
Thanks for your feedback. These forums are great.
L5

Markus and David,
First let me thank you for your posts. :-).
Markus:
Thank you for the tip. However, I usually do installations with a domain adm user. It does a lot of user switching, yes, but then it only switches to users created by SAPINST, that is most of the time it is switching to <sid>adm, which sounds perfect. At the time of my post I had been setting some environment variables so as to try to get the procedure to distribute the various pieces and bits (saparch, sapbackup, saptrace, origlogs and mirror logs, datafiles, etc. exactly where I wanted them and not where the procedure wants them) so I ended up by using <sid>adm to perform the DB instance installation and not the domain adm user I had installed CI with (I forgot to change back). When I noticed I figured it wouldn't make a difference since it usually switches to <sid>adm anyway. However, for the next attempts I settled on ny initially created dom adm user and no change to the results. OracleService<SID> usually logs on as a system account so the issue doesn't arise, I think.
and
David:
The brackets did it. Thank you so much. It went further and only crashed later, I don't usually potter around sdn, so I'm not familiar with the workings of this, I don't know how to reply separately to the posts and I don't know how to include a properly formatted post (I've seen the Plain Text help but I hate to bother with sidetrack details) so I apologize to all for the probably-too-compact jumble that will come out when I post this. I am now looking at the following problem (same migration to 64) so I fear I may have to close this post and get back with a new one if I can't solve this next issue.

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