diff --git a/Source/Core/VideoCommon/HiresTextures.cpp b/Source/Core/VideoCommon/HiresTextures.cpp
index efe3ab58bc..e6f687a551 100644
--- a/Source/Core/VideoCommon/HiresTextures.cpp
+++ b/Source/Core/VideoCommon/HiresTextures.cpp
@@ -140,7 +140,10 @@ void HiresTexture::Prefetch()
 	Common::SetCurrentThreadName("Prefetcher");
 
 	size_t size_sum = 0;
-	size_t max_mem = MemPhysical() / 2;
+	size_t sys_mem = MemPhysical();
+	size_t recommended_min_mem = 2 * size_t(1024 * 1024 * 1024);
+	// keep 2GB memory for system stability if system RAM is 4GB+ - use half of memory in other cases
+	size_t max_mem = (sys_mem / 2 < recommended_min_mem) ? (sys_mem / 2) : (sys_mem - recommended_min_mem);
 	u32 starttime = Common::Timer::GetTimeMs();
 	for (const auto& entry : s_textureMap)
 	{