diff --git a/BizHawk.MultiClient/tools/ToolHelpers.cs b/BizHawk.MultiClient/tools/ToolHelpers.cs
index 57549aa53c..f452b71d4e 100644
--- a/BizHawk.MultiClient/tools/ToolHelpers.cs
+++ b/BizHawk.MultiClient/tools/ToolHelpers.cs
@@ -8,7 +8,7 @@ namespace BizHawk.MultiClient
 {
 	class ToolHelpers
 	{
-		public static ToolStripMenuItem[] GenerateMemoryDomainMenuItems(Action<int> SetCallback, string SelectedDomain = "")
+		public static ToolStripMenuItem[] GenerateMemoryDomainMenuItems(Action<int> SetCallback, string SelectedDomain = "", int? maxSize = null)
 		{
 			var items = new List<ToolStripMenuItem>();
 
@@ -28,6 +28,11 @@ namespace BizHawk.MultiClient
 						item.Checked = true;
 					}
 
+					if (maxSize.HasValue && domain.Size > maxSize.Value)
+					{
+						item.Enabled = false;
+					}
+
 					items.Add(item);
 					counter++;
 				}
diff --git a/BizHawk.MultiClient/tools/Watch/RamSearch.cs b/BizHawk.MultiClient/tools/Watch/RamSearch.cs
index a1a5bf3724..2bf7c9efeb 100644
--- a/BizHawk.MultiClient/tools/Watch/RamSearch.cs
+++ b/BizHawk.MultiClient/tools/Watch/RamSearch.cs
@@ -45,7 +45,8 @@ namespace BizHawk.MultiClient
 
 		private bool dropdown_dontfire = false; //Used as a hack to get around lame .net dropdowns, there's no way to set their index without firing the selectedindexchanged event!
 
-		public const int MaxDetailedSize = 1048576; //1mb, semi-arbituary decision, sets the size to check for and automatically switch to fast mode for the user
+		public const int MaxDetailedSize = (1024 * 1024); //1mb, semi-arbituary decision, sets the size to check for and automatically switch to fast mode for the user
+		public const int MaxSupportedSize = (1024 * 1024 * 64); //64mb, semi-arbituary decision, sets the maximum size ram search will support (as it will crash beyond this)
 
 		#region Initialize, Load, and Save
 
@@ -851,7 +852,7 @@ namespace BizHawk.MultiClient
 		private void MemoryDomainsSubMenu_DropDownOpened(object sender, EventArgs e)
 		{
 			MemoryDomainsSubMenu.DropDownItems.Clear();
-			MemoryDomainsSubMenu.DropDownItems.AddRange(ToolHelpers.GenerateMemoryDomainMenuItems(SetMemoryDomain, Searches.DomainName));
+			MemoryDomainsSubMenu.DropDownItems.AddRange(ToolHelpers.GenerateMemoryDomainMenuItems(SetMemoryDomain, Searches.DomainName, MaxSupportedSize));
 		}
 
 		private void SizeSubMenu_DropDownOpened(object sender, EventArgs e)