ECC Windows APP SERVERS to offload 2 of 5 DIA instances from i570-10way

We need a cost effective solution to get us over a hump for a few months.
We recently created 2 more DIA instances on our i570 ECC 6.0 Unicode server and due to the nature of the ABAP code running on those 2 instances (SAP pricing routines), we just cannot absorb the CPU demand and are pegging the CPU utilization frequently.
So, we need to separate the 2 new DIA instances and remove them from the i5. (already running CI & 3 DIA instances)
We only need to run this application in this fashion for about 5 months, so don't want to heavily invest in adding 2 more i5 CPU's  (which are already in the box being a 10way) and about 20+GB more memory.
Has anyone successfully put Intel / Windows app servers into their i5 solution landscape?  Anything special required to support this multi-platform <SID>.
Realize the kernels would be different and not sure the complexities that will introduce, but we're already in discussion with Volker G. to take care of that for us.  
Don't have to be concerned about backup strategy as the APP servers don't change except as a result of a kernel patch.
Don't need too much disk, so can go with internel to the xSeries server.
Naturally, there will be overhead from the APP server to DB but that's acceptable (within reason)
Sizing for xSeries -- 4way/quad core 32GB memory for each app server?
Feedback very much appreciated -- been running ECC on i for 10.5 years now
Regards
Doreen Anderson

Chris - thank you for responding with accurate information
Chris - Yes, did realize that the 1st answer to my post was incorrect information for the i5/OS platform and am very disappointed that is "allowed" in the forums.  Can a moderator delete?
Volker - thank you for the feedback for the xSeries size and also the heads up that we will need to isolate the traffic from xSeries to iSeries "app server to db server" on it's own which will require the extra ethernet card in the i5. 
We do have 3 ethernet cards in the i5 already but they are all being used.  2 for SAP virtual ip to make highly available and 1 to keep the MIMIX traffic on it's own. 
We will plan for a 4th (maybe even a 5th for virtual ha) ethernet card(s) for the i5 and yes 2 (actually 3 for HA) for the xSeries.
Just recently found a nice i5/OS link on SDN & not sure if everyone knows about it -
SAP on IBM DB2 for i5/OS: Database Interface Notes
SAP on i5/OS - Database Interface Notes
Windows/Linux App-Server
SAP Note Number
SAP Note
751451
XDA Database Client for Windows and LinuxPPC
585468
Analysis: XDA Authentication failure to DB2 for i5/OS
564395
Win: Applying Application Server Kernel Patches
682281
HowTo: Starting Win AppServer from i5/OS Central Host
449187
Adjusting Ethernet Performance Manually
Thank you to Chris and Volker!

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