To Bob Bone and Ajkimba, I was running 3 1010s and I did not have to sync them at all by Spdif.
Running 3 cards independently.
Just to let you know.
dan
 

Hi Al, when I refer to plugins in these threads, I mean audio FX plugins, like EQ or reverb, or I mean soft synths, like Dimension Pro or Rapture.  If I understood your above post, you seemed to think I was talking about extensions to browsers, like plugins for Firefox or Internet Explorer.  If that is what you thought I meant - I wasn't - as noted above I really meant effects/synths in Sonar.
 
Some plugin effects cause giant latency spikes, due to how they are designed - and they do this on purpose.  These kinds of effects, like convoluted reverb use something called 'look-ahead' processing, where they load up audio that hasn't been played yet, and they analyze that audio as part of generating their effect.  These plugins are not meant to be used during the actual recording process because of the high latency that kind of processing requires.  They are meant to be used during the mixing/mastering process.
 
During mixing/mastering, folks routinely raise the size of their ASIO Buffer to as much as 1024, to accommodate that kind of effect plugin, and for that purpose, everything works OK.
 
During recording, however, latency needs to be at or less than around 10 milliseconds, to allow tracking without dropouts and lag and crackles and all that.  For recording, an ASIO Buffer Size of 128 is much better, and therefore those 'mixing/master' effects plugins just don't work during recording of tracks.
 
I hope that better explains things, 
 
Bob Bone
 

Al, I too have 2 Delta 1010lt cards in my Win 7 64 bit (Home version) computer. When I was running one Delta 1010lt with XP, I had no problems. If you search, M Audio's website they will tell you that the Win 7 drivers, and two card linking is not compatible.
One time while using Win XP, I synched my Delta 1010 with my mother board and had 16 outputs, using a SPDIF connector to the MB. It wasn't perfect and worked pretty good most of the time, but the MB audio had slow latency. Back to Win 7 and the Delta 1010's using multiple cards; some people reported no problems using Win7 with the Delta drivers, I thought I was one of them. But after a while I started to hear random clicks and pops in my Audio tracks, also sometimes affecting my midi tracks that have audio sound modules in my Sonar project. It's been driving crazy me for three years. I changed hard drives, though it might be my mixer at one time. I've changed just about every setting Cakewalk let me, I used the one processor mode instead of the 8 core, and thought about getting a faster processor (like 3.6 Mhz @ 8 cores is slow for audio, it's even great for video processing), I've thought, maybe it's the video card (HD7850), or the memory? I have a Asus M5A88-v evo MB, 16 GB of ram, AMD FX8150 - 8 core 3.6 Mhz processor. I use a separate Hard drive for my Sonar projects and Audio, and have a external backup for that drive. About three weeks ago, another computer of mine blew out. Don't know who caused what, but the Power supply went, then the MB wouldn't boot with a new one, so I bought a new motherboard and processor. I only bought 8GB of ddr3 ram, the old one had 16GB of ddr2 ram. Using the same Video card, some gaming programs would not work. Now do I buy another 8GB of memory, or a new video card or both. Before I made the decision, I stole 8GB from my Sonar computer, and put it in to make 16GB. Had the same problem, to make a story short, I bought a new R9 series video card, and 8GB of MB memory was enough. When I put the 8GB memory back in my Sonar computer, I start hearing high pitched floor noise I've never noticed before that wasn't showing on my meters. Now what did I do? I just borrowed 2 sticks of 8GB of 16GB of total memory, I then swapped those 2 memory sticks around, and got same results. I think my mixer gain was up? The floor noise (that sound like clocking) could have been there before, I probably just didn't notice it? I still got the random pops, clicks I've gotten for years now and then. So thinking about the clocking noise, I decided to let the Delta 1010lt card number 2, be the master clock (internal), swap the spdif connectors around and let card number 1, get its' clock external through the spdif connection. The floor noise is still there, but you still can't see it on my digital VU meters, (I think now, it was always there), but I have no more audio ticks, pops, clicks, dropouts. Both cards are set to (using the M delta control panel) 48000 Hz, and 4096 samples. I record all my tracks @ 48K and 16 bits. A simple swap of who's master and who's slave, has made me a happy camper. Who would have thought that? I did use a regular short RCA cable to connect the spdif connectors on the Delta cards together at first, but when I started getting the clicks and pops, I bought the right connector on the internet, which didn't fix the problem. Now that my audio problem has stopped, I lowered my audio Sonar settings, sync and cache both to 512, and the midi playback to 512 ms also. Playback is perfect, waited a while before posting, because this isn't the first time I thought I found a solution. I also mixdown to another computer with one Delta 1010lt card, and Win 7. 
Today I found I still have a problem with Sonar 3, if I use the count-in to record, using the Audio drivers, my pre-recorded Midi drum tracks are thrown off timing. So I have to use no count in or use the metronome through the Midi output. But I'm happy I got rid of those annoying clicks, and pops. The audio output is flawless now. I hope this helps someone else with Delta card problems. Remember M-audio has stated on their website that they do not recommend having more than one Delta 1010lt cards, with Win 7. I hope you get lucky also, I was ready to take these cards out, and try another product. The swapping of the spdif signal can be switched quickly using M-Audio panel, clicking on the hardware tab, to see if they are synched. If your two cards are not synched together via a spdif cable, you will have all kinds of problems. One has to be the master, and the other has to be synched to the other one. There is no way around this.   Rich.