diff --git a/RELEASE.txt b/RELEASE.txt
index 96352882b..abf35629d 100755
--- a/RELEASE.txt
+++ b/RELEASE.txt
@@ -75,6 +75,8 @@ This document describes the differences between v7.0.0 and v6.x.x
 - rxr src files and classes (detectordata, ZmqSocket, helpDacs) added to sls namespace, and macros (namely from logger (logINFO etc)), slsDetectorGui (make_unique in implemtnation requires sls nemspace (points to std otherwise) but not deectorImpl.cpp)
 - blackfin programing made seamless (nCE fixed which helps)
 -save settings file for m3 and eiger
+- g2 and m3 clkdiv 2 (system clock) change should affect time settings (g2: exptime, period, delayaftertrigger, burstperiod, m3: exptime, gatedelay, gateperiod, period, delayaftertrigger)
+- g2 system frequency is the same irrespective of timing source
 
 2. Resolved Issues
 ==================
diff --git a/slsDetectorServers/gotthard2DetectorServer/bin/gotthard2DetectorServer_developer b/slsDetectorServers/gotthard2DetectorServer/bin/gotthard2DetectorServer_developer
index aadfc5f1a..3b19c601a 100755
Binary files a/slsDetectorServers/gotthard2DetectorServer/bin/gotthard2DetectorServer_developer and b/slsDetectorServers/gotthard2DetectorServer/bin/gotthard2DetectorServer_developer differ
diff --git a/slsDetectorServers/gotthard2DetectorServer/slsDetectorFunctionList.c b/slsDetectorServers/gotthard2DetectorServer/slsDetectorFunctionList.c
index e43d711ea..e65719c07 100644
--- a/slsDetectorServers/gotthard2DetectorServer/slsDetectorFunctionList.c
+++ b/slsDetectorServers/gotthard2DetectorServer/slsDetectorFunctionList.c
@@ -2297,6 +2297,24 @@ int setClockDivider(enum CLKINDEX ind, int val) {
             setPhase(i, oldPhases[i], 1);
         }
     }
+
+    // update system frequency and time settings that depend on it
+    if (ind == SYSTEM_C0) {
+        LOG(logINFO, ("\tUpdating time settings (sys freq change)\n"));
+        int64_t exptime = getExpTime();
+        int64_t period = getPeriod();
+        int64_t delayAfterTrigger = getDelayAfterTrigger();
+        int64_t burstPeriod = getBurstPeriod();
+        
+        systemFrequency = ((double)getVCOFrequency(SYSTEM_C0) /
+                        (double)clkDivider[SYSTEM_C0]);
+
+        setExpTime(exptime);
+        setPeriod(period);
+        setDelayAfterTrigger(delayAfterTrigger);
+        setBurstPeriod(burstPeriod);
+        LOG(logINFO, ("\tDone updating time settings\n"));
+    }
     return OK;
 }
 
@@ -2798,13 +2816,10 @@ void setTimingSource(enum timingSourceType value) {
     case TIMING_INTERNAL:
         LOG(logINFO, ("Setting timing source to internal\n"));
         bus_w(addr, (bus_r(addr) & ~CONTROL_TIMING_SOURCE_EXT_MSK));
-        systemFrequency = INT_SYSTEM_C0_FREQUENCY;
         break;
     case TIMING_EXTERNAL:
         LOG(logINFO, ("Setting timing source to exernal\n"));
         bus_w(addr, (bus_r(addr) | CONTROL_TIMING_SOURCE_EXT_MSK));
-        systemFrequency = ((double)getVCOFrequency(SYSTEM_C0) /
-                           (double)clkDivider[SYSTEM_C0]);
         break;
     default:
         LOG(logERROR, ("Unknown timing source %d\n", value));
diff --git a/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServer_developer b/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServer_developer
index ffc54469f..59ce094cc 100755
Binary files a/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServer_developer and b/slsDetectorServers/mythen3DetectorServer/bin/mythen3DetectorServer_developer differ
diff --git a/slsDetectorServers/mythen3DetectorServer/slsDetectorFunctionList.c b/slsDetectorServers/mythen3DetectorServer/slsDetectorFunctionList.c
index d943322c5..ce96f5f78 100644
--- a/slsDetectorServers/mythen3DetectorServer/slsDetectorFunctionList.c
+++ b/slsDetectorServers/mythen3DetectorServer/slsDetectorFunctionList.c
@@ -1331,7 +1331,7 @@ int setTrimbits(int *trimbits) {
     uint32_t prevRunClk = clkDivider[SYSTEM_C0];
 
     // set to trimming clock
-    if (setClockDivider(SYSTEM_C0, DEFAULT_TRIMMING_RUN_CLKDIV) == FAIL) {
+    if (setClockDividerWithTimeUpdateOption(SYSTEM_C0, DEFAULT_TRIMMING_RUN_CLKDIV, 0) == FAIL) {
         LOG(logERROR,
             ("Could not start trimming. Could not set to trimming clock\n"));
         return FAIL;
@@ -1364,7 +1364,7 @@ int setTrimbits(int *trimbits) {
     }
 
     // set back to previous clock
-    if (setClockDivider(SYSTEM_C0, prevRunClk) == FAIL) {
+    if (setClockDividerWithTimeUpdateOption(SYSTEM_C0, prevRunClk, 0) == FAIL) {
         LOG(logERROR, ("Could not set to previous run clock after trimming\n"));
         return FAIL;
     }
@@ -2215,6 +2215,10 @@ int getVCOFrequency(enum CLKINDEX ind) {
 int getMaxClockDivider() { return ALTERA_PLL_C10_GetMaxClockDivider(); }
 
 int setClockDivider(enum CLKINDEX ind, int val) {
+    return setClockDividerWithTimeUpdateOption(ind, val, 1);
+}
+
+int setClockDividerWithTimeUpdateOption(enum CLKINDEX ind, int val, int timeUpdate) {
     if (ind < 0 || ind >= NUM_CLOCKS) {
         LOG(logERROR, ("Unknown clock index %d to set clock divider\n", ind));
         return FAIL;
@@ -2239,6 +2243,32 @@ int setClockDivider(enum CLKINDEX ind, int val) {
     int pllIndex = (int)(ind >= SYSTEM_C0 ? SYSTEM_PLL : READOUT_PLL);
     int clkIndex = (int)(ind >= SYSTEM_C0 ? ind - SYSTEM_C0 : ind);
     ALTERA_PLL_C10_SetOuputClockDivider(pllIndex, clkIndex, val);
+
+    // Update time settings that depend on system frequency
+    // timeUpdate = 0 for setChipRegister/setTrimbits etc
+    // as clk reverted back again
+    if (timeUpdate && ind == SYSTEM_C0) {
+        LOG(logINFO, ("\tUpdating time settings (sys freq change)\n"));
+        int64_t exptime[3] = {0, 0, 0};
+        int64_t gateDelay[3] = {0, 0, 0};
+        for (int i = 0; i != 3; ++i) {
+            exptime[i] = getExpTime(i);
+            gateDelay[i] = getGateDelay(i);
+        }
+        int64_t period = getPeriod();
+        int64_t delayAfterTrigger = getDelayAfterTrigger();
+        
+        clkDivider[ind] = val;
+
+        for (int i = 0; i != 3; ++i) {
+            setExpTime(i, exptime[i]);
+            setGateDelay(i, gateDelay[i]);
+        }
+        setPeriod(period);
+        setDelayAfterTrigger(delayAfterTrigger);
+        LOG(logINFO, ("\tDone updating time settings\n"));
+    }
+
     clkDivider[ind] = val;
     LOG(logINFO, ("\t%s clock (%d) divider set to %d\n", clock_names[ind], ind,
                   clkDivider[ind]));
@@ -2629,7 +2659,7 @@ int setChipStatusRegister(int csr) {
     uint32_t prevRunClk = clkDivider[SYSTEM_C0];
 
     // set to trimming clock
-    if (setClockDivider(SYSTEM_C0, DEFAULT_TRIMMING_RUN_CLKDIV) == FAIL) {
+    if (setClockDividerWithTimeUpdateOption(SYSTEM_C0, DEFAULT_TRIMMING_RUN_CLKDIV, 0) == FAIL) {
         LOG(logERROR,
             ("Could not set to trimming clock in order to change CSR\n"));
         return FAIL;
@@ -2651,7 +2681,7 @@ int setChipStatusRegister(int csr) {
     }
 
     // set back to previous clock
-    if (setClockDivider(SYSTEM_C0, prevRunClk) == FAIL) {
+    if (setClockDividerWithTimeUpdateOption(SYSTEM_C0, prevRunClk, 0) == FAIL) {
         LOG(logERROR,
             ("Could not set to previous run clock after changing CSR\n"));
         return FAIL;
diff --git a/slsDetectorServers/slsDetectorServer/include/slsDetectorFunctionList.h b/slsDetectorServers/slsDetectorServer/include/slsDetectorFunctionList.h
index 05d84e9b4..3ae08b95d 100644
--- a/slsDetectorServers/slsDetectorServer/include/slsDetectorFunctionList.h
+++ b/slsDetectorServers/slsDetectorServer/include/slsDetectorFunctionList.h
@@ -565,6 +565,7 @@ int getFrequency(enum CLKINDEX ind);
 int getVCOFrequency(enum CLKINDEX ind);
 int getMaxClockDivider();
 int setClockDivider(enum CLKINDEX ind, int val);
+int setClockDividerWithTimeUpdateOption(enum CLKINDEX ind, int val, int timeUpdate);
 int getClockDivider(enum CLKINDEX ind);
 
 #elif GOTTHARD2D
diff --git a/slsSupportLib/include/sls/versionAPI.h b/slsSupportLib/include/sls/versionAPI.h
index 6674b9f8d..97ff2a907 100644
--- a/slsSupportLib/include/sls/versionAPI.h
+++ b/slsSupportLib/include/sls/versionAPI.h
@@ -7,8 +7,8 @@
 #define APIGUI       0x220328
 #define APICTB 0x220524
 #define APIGOTTHARD 0x220524
-#define APIGOTTHARD2 0x220524
 #define APIJUNGFRAU 0x220524
-#define APIMYTHEN3 0x220524
 #define APIMOENCH 0x220519
 #define APIEIGER 0x220524
+#define APIMYTHEN3 0x220602
+#define APIGOTTHARD2 0x220602