diff --git a/checkin_notes b/checkin_notes
index 1a9e382538..66216f41d8 100644
--- a/checkin_notes
+++ b/checkin_notes
@@ -852,3 +852,14 @@ Rom    21 Jan 2012
         
     samples/vboxwrapper
         vboxwrapper.cpp
+
+Rom    21 Jan 2012
+    - sched: adjust the vbox??_mt plan classes to use 1.5 CPUs instead
+        of the full 2 CPUs. Vboxwrapper uses ceil() to allocate enough
+        whole CPUs for Virtualbox.  Ideally this will cause the BOINC
+        client-side scheduler to use the remaining fraction of the CPU
+        for GPU data transfer which will then free up one whole CPU for
+        another job.  All without over-commiting anything.
+        
+    sched/
+        sched_customize.cpp
diff --git a/sched/sched_customize.cpp b/sched/sched_customize.cpp
index 6ee7fa4292..7fd9e07043 100644
--- a/sched/sched_customize.cpp
+++ b/sched/sched_customize.cpp
@@ -550,18 +550,20 @@ static inline bool app_plan_vbox(
     }
 
     if (strstr(plan_class, "mt") && can_use_multicore) {
+        // Use number of usable CPUs, taking user prefs into account
         double ncpus = g_wreq->effective_ncpus;
-            // number of usable CPUs, taking user prefs into account
-        int nthreads = (int)ncpus;
-        if (nthreads > 2) nthreads = 2;
-        hu.avg_ncpus = nthreads;
-        sprintf(hu.cmdline, "--nthreads %d", nthreads);
+        // CernVM on average uses between 25%-50% of a second core
+        // Total on a dual-core machine is between 65%-75%
+        if (ncpus > 1.5) ncpus = 1.5;
+        hu.avg_ncpus = ncpus;
+        hu.max_ncpus = 2.0;
+        sprintf(hu.cmdline, "--nthreads %f", ncpus);
     } else {
         hu.avg_ncpus = 1;
+        hu.max_ncpus = 1;
     }
-    hu.max_ncpus = hu.avg_ncpus;
     hu.projected_flops = capped_host_fpops()*hu.avg_ncpus;
-    hu.peak_flops = capped_host_fpops()*hu.avg_ncpus;
+    hu.peak_flops = capped_host_fpops()*hu.max_ncpus;
     if (config.debug_version_select) {
         log_messages.printf(MSG_NORMAL,
             "[version] %s app projected %.2fG\n",