diff --git a/src/machine/machine_table.c b/src/machine/machine_table.c
index e841a8538..da3df57b6 100644
--- a/src/machine/machine_table.c
+++ b/src/machine/machine_table.c
@@ -2665,7 +2665,7 @@ const machine_t machines[] = {
         .flags = MACHINE_FLAGS_NONE,
         .ram = {
             .min = 256,
-            .max = 15872,
+            .max = 640,
             .step = 128
         },
         .nvrmask = 127,
@@ -2705,8 +2705,8 @@ const machine_t machines[] = {
         .flags = MACHINE_FLAGS_NONE,
         .ram = {
             .min = 256,
-            .max = 15872,
-            .step = 128
+            .max = 512,
+            .step = 256
         },
         .nvrmask = 63,
         .kbc_device = NULL,
@@ -3030,8 +3030,8 @@ const machine_t machines[] = {
         .flags = MACHINE_FLAGS_NONE,
         .ram = {
             .min = 256,
-            .max = 15872,
-            .step = 128
+            .max = 512,
+            .step = 256
         },
         .nvrmask = 63,
         .kbc_device = NULL,
@@ -3070,8 +3070,8 @@ const machine_t machines[] = {
         .flags = MACHINE_FLAGS_NONE,
         .ram = {
             .min = 256,
-            .max = 15872,
-            .step = 128
+            .max = 512,
+            .step = 256
         },
         .nvrmask = 63,
         .kbc_device = NULL,