diff --git a/tests/boot-ram.dhall b/tests/boot-ram.dhall
new file mode 100644
index 0000000..03422a1
--- /dev/null
+++ b/tests/boot-ram.dhall
@@ -0,0 +1,9 @@
+-- SPDX-License-Identifier: CC0-1.0
+
+let Genode = env:DHALL_GENODE
+
+let sumRam =
+        λ(boot : Genode.Boot.Type)
+      → let sum = Genode.Init.sumResources boot.config in sum.ram
+
+in  sumRam
diff --git a/tests/driver-hw.nix b/tests/driver-hw.nix
index de62698..588fd78 100644
--- a/tests/driver-hw.nix
+++ b/tests/driver-hw.nix
@@ -37,7 +37,7 @@ let
   defaultScript = ''run_genode_until {child "init" exited with exit value 0} 60'';
 
   mkTest = { name ? "unamed", testScript ? defaultScript, testConfig, testInputs ? [ ]
-    , env ? { }, qemuMem ? 32, ... # TODO: remove ...
+    , env ? { }, ... # TODO: remove ...
     }@t:
     let
       manifest = lib.mergeManifests (with testPkgs;
@@ -89,10 +89,11 @@ let
             return
           }
 
+          global env
           global spawn_id
           spawn ${hostPkgs.qemu_test}/bin/qemu-system-x86_64 \
             -machine q35 -serial mon:stdio -nographic \
-            -m size=${toString qemuMem} \
+            -m size=[expr ($env(TEST_RAM) / 1048576) + 16] \
             -kernel "${testPkgs.bender}" \
             -initrd "${image}"
           wait_for_output $wait_for_re $timeout_value $spawn_id
@@ -109,14 +110,18 @@ let
           inherit baseSetup testConfig testScript;
           preferLocalBuild = true;
           testName = name;
+          DHALL_GENODE = "${testPkgs.dhallGenode}/package.dhall";
+          MANIFEST = manifest;
         } ''
           mkdir -p $out/bin
           echo "$testScript" > $out/test-script
           echo "$baseSetup" > $out/base-setup
+          eval $(${apps.dhall-to-bash.program} --declare "TEST_RAM" <<< "${./boot-ram.dhall} ${testConfig}")
           ln -s ${testDriver}/bin/genode-test-driver $out/bin/
           wrapProgram $out/bin/genode-test-driver \
-            --run "export testScript=\"\$(cat $out/test-script)\"" \
-            --run "export baseSetup=\"\$(cat $out/base-setup)\"" \
+            --set testScript "$testScript" \
+            --set baseSetup "$baseSetup" \
+            --set TEST_RAM $TEST_RAM \
         '';
 
       passMeta = drv:
diff --git a/tests/driver-nova.nix b/tests/driver-nova.nix
index 3edb93f..d31118d 100644
--- a/tests/driver-nova.nix
+++ b/tests/driver-nova.nix
@@ -37,7 +37,7 @@ let
   defaultScript = ''run_genode_until {child "init" exited with exit value 0} 60'';
 
   mkTest = { name ? "unamed", testScript ? defaultScript, testConfig, testInputs ? [ ]
-    , env ? { }, qemuMem ? 32, ... # TODO: remove ...
+    , env ? { }, ... # TODO: remove ...
     }@t:
     let
       manifest = lib.mergeManifests (with testPkgs;
@@ -89,10 +89,11 @@ let
             return
           }
 
+          global env
           global spawn_id
           spawn ${hostPkgs.qemu_test}/bin/qemu-system-x86_64 \
             -machine q35 -serial mon:stdio -nographic \
-            -m size=${toString qemuMem} \
+            -m size=[expr ($env(TEST_RAM) / 1048576) + 16] \
             -kernel "${testPkgs.bender}" \
             -initrd "${testPkgs.NOVA}/hypervisor-x86_64 arg=iommu novpid serial,${image}"
           wait_for_output $wait_for_re $timeout_value $spawn_id
@@ -109,14 +110,18 @@ let
           inherit baseSetup testConfig testScript;
           preferLocalBuild = true;
           testName = name;
+          DHALL_GENODE = "${testPkgs.dhallGenode}/package.dhall";
+          MANIFEST = manifest;
         } ''
           mkdir -p $out/bin
           echo "$testScript" > $out/test-script
           echo "$baseSetup" > $out/base-setup
+          eval $(${apps.dhall-to-bash.program} --declare "TEST_RAM" <<< "${./boot-ram.dhall} ${testConfig}")
           ln -s ${testDriver}/bin/genode-test-driver $out/bin/
           wrapProgram $out/bin/genode-test-driver \
-            --run "export testScript=\"\$(cat $out/test-script)\"" \
-            --run "export baseSetup=\"\$(cat $out/base-setup)\"" \
+            --set testScript "$testScript" \
+            --set baseSetup "$baseSetup" \
+            --set TEST_RAM $TEST_RAM \
         '';
 
       passMeta = drv:
diff --git a/tests/noux.nix b/tests/noux.nix
index 6fc3ff3..d683cca 100644
--- a/tests/noux.nix
+++ b/tests/noux.nix
@@ -13,6 +13,5 @@ testEnv.mkTest rec {
     noux
     posix
   ];
-  qemuMem = 64;
   meta.maintainers = with pkgs.stdenv.lib.maintainers; [ ehmry ];
 }
diff --git a/tests/solo5/default.nix b/tests/solo5/default.nix
index 67f5745..7263181 100644
--- a/tests/solo5/default.nix
+++ b/tests/solo5/default.nix
@@ -53,7 +53,6 @@ let
       testScript = ''
         run_genode_until {child "init" exited with exit value 0} 30
       '';
-      qemuMem = 64;
     }
 
     {
@@ -62,7 +61,6 @@ let
       testScript = ''
         run_genode_until {child "init" exited with exit value 0} 30
       '';
-      qemuMem = 64;
     }
 
     {