diff --git a/.travis.yml b/.travis.yml
index 93484365c..f0d1ac70e 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,12 +1,16 @@
 sudo: false
 language: scala
 scala: 2.11.1
-jdk: openjdk7
+jdk:
+  - openjdk7
+  - openjdk8
+  - oraclejdk7
+  - oraclejdk8
 
 notifications:
   email: false
 env:
   global: TERM=dumb
 
-install: ./gradlew setupCIWorkspace
-script: ./gradlew build
\ No newline at end of file
+install: gradle setupCIWorkspace
+script: gradle build
diff --git a/src/main/java/li/cil/oc/api/internal/ServerRack.java b/src/main/java/li/cil/oc/api/internal/ServerRack.java
index 46447ed45..9f8d2cd0c 100644
--- a/src/main/java/li/cil/oc/api/internal/ServerRack.java
+++ b/src/main/java/li/cil/oc/api/internal/ServerRack.java
@@ -22,12 +22,12 @@ import net.minecraft.inventory.IInventory;
  */
 public interface ServerRack extends Environment, SidedEnvironment, Rotatable, IInventory {
     /**
-     * The machine currently hosted by the server in the specified slot.
+     * The server in the specified slot.
      * <p/>
-     * This can be <tt>null</tt>, for example when there is no CPU installed
-     * in the server in that slot, or there is no server in that slot.
+     * This can be <tt>null</tt>, for example when there is no server installed
+     * in that slot.
      *
-     * @return the machine currently hosted in the specified slot.
+     * @return the server currently hosted in the specified slot.
      */
     Server server(int slot);
 
diff --git a/src/main/resources/application.conf b/src/main/resources/application.conf
index cf5abbfc6..6dace2db1 100644
--- a/src/main/resources/application.conf
+++ b/src/main/resources/application.conf
@@ -1172,6 +1172,13 @@ opencomputers {
     # Time in seconds to pause a calling machine when the soft limit for a data
     # card callback is exceeded.
     dataCardTimeout: 1.0
+
+    # The general upgrade tier of the switch built into server racks, i.e. how
+    # upgraded server racks' switching logic is. Prior to the introduction of
+    # this setting (1.5.15) this was always none. This applies to all
+    # properties, i.e. througput, frequency and buffer size.
+    # Valid values are: 0 = none, 1 = tier 1, 2 = tier 2, 3 = tier 3.
+    serverRackSwitchTier: 1
   }
 
   # Settings for mod integration (the mod previously known as OpenComponents).
diff --git a/src/main/scala/li/cil/oc/Settings.scala b/src/main/scala/li/cil/oc/Settings.scala
index 4856e2a72..f6048f21d 100644
--- a/src/main/scala/li/cil/oc/Settings.scala
+++ b/src/main/scala/li/cil/oc/Settings.scala
@@ -9,6 +9,7 @@ import com.google.common.net.InetAddresses
 import com.mojang.authlib.GameProfile
 import com.typesafe.config._
 import li.cil.oc.api.component.TextBuffer.ColorDepth
+import li.cil.oc.common.Tier
 import li.cil.oc.integration.Mods
 import net.minecraftforge.fml.common.Loader
 import net.minecraftforge.fml.common.versioning.DefaultArtifactVersion
@@ -325,6 +326,7 @@ class Settings(val config: Config) {
   val dataCardSoftLimit = config.getInt("misc.dataCardSoftLimit") max 0
   val dataCardHardLimit = config.getInt("misc.dataCardHardLimit") max 0
   val dataCardTimeout = config.getDouble("misc.dataCardTimeout") max 0
+  val serverRackSwitchTier = (config.getInt("misc.serverRackSwitchTier") - 1) max Tier.None min Tier.Three
 
   // ----------------------------------------------------------------------- //
   // printer
diff --git a/src/main/scala/li/cil/oc/common/EventHandler.scala b/src/main/scala/li/cil/oc/common/EventHandler.scala
index 3d5d2222e..5b66afe45 100644
--- a/src/main/scala/li/cil/oc/common/EventHandler.scala
+++ b/src/main/scala/li/cil/oc/common/EventHandler.scala
@@ -5,6 +5,7 @@ import java.util.Calendar
 import li.cil.oc._
 import li.cil.oc.api.Network
 import li.cil.oc.api.detail.ItemInfo
+import li.cil.oc.api.internal.ServerRack
 import li.cil.oc.api.machine.MachineHost
 import li.cil.oc.client.renderer.PetRenderer
 import li.cil.oc.common.asm.ClassTransformer
@@ -322,7 +323,15 @@ object EventHandler {
       e.getChunk.getEntityLists.foreach(_.collect {
         case host: MachineHost => host.machine match {
           case machine: Machine => scheduleClose(machine)
+          case _ => // Dafuq?
         }
+        case rack: ServerRack =>
+          (0 until rack.getSizeInventory).
+            map(rack.server).
+            filter(_ != null).
+            map(_.machine()).
+            filter(_ != null).
+            foreach(_.stop())
       })
     }
   }
diff --git a/src/main/scala/li/cil/oc/common/tileentity/ServerRack.scala b/src/main/scala/li/cil/oc/common/tileentity/ServerRack.scala
index 0c30bd3b8..3286af6db 100644
--- a/src/main/scala/li/cil/oc/common/tileentity/ServerRack.scala
+++ b/src/main/scala/li/cil/oc/common/tileentity/ServerRack.scala
@@ -51,6 +51,11 @@ class ServerRack extends traits.PowerAcceptor with traits.Hub with traits.PowerB
   // Used on client side to check whether to render disk activity indicators.
   var lastAccess = Array.fill(4)(0L)
 
+  val builtInSwitchTier = Settings.get.serverRackSwitchTier
+  relayDelay = math.max(1, relayBaseDelay - (builtInSwitchTier + 1) * relayDelayPerUpgrade)
+  relayAmount = math.max(1, relayBaseAmount + (builtInSwitchTier + 1) * relayAmountPerUpgrade)
+  maxQueueSize = math.max(1, queueBaseSize + (builtInSwitchTier + 1) * queueSizePerUpgrade)
+
   override def server(slot: Int) = servers(slot).orNull
 
   @SideOnly(Side.CLIENT)