diff --git a/dependencies/FindO2GPU.cmake b/dependencies/FindO2GPU.cmake
index 95db55041184f..d50705d106bf3 100644
--- a/dependencies/FindO2GPU.cmake
+++ b/dependencies/FindO2GPU.cmake
@@ -162,7 +162,7 @@ if(ENABLE_CUDA)
     if(GPUCA_DETERMINISTIC_MODE GREATER_EQUAL ${GPUCA_DETERMINISTIC_MODE_MAP_NO_FAST_MATH})
       string(APPEND CMAKE_CUDA_FLAGS_${CMAKE_BUILD_TYPE_UPPER} " ${GPUCA_CUDA_NO_FAST_MATH_FLAGS}")
     elseif(NOT CMAKE_BUILD_TYPE_UPPER STREQUAL "DEBUG")
-      string(APPEND CMAKE_CUDA_FLAGS_${CMAKE_BUILD_TYPE_UPPER} " -use_fast_math --ftz=true")
+      string(APPEND CMAKE_CUDA_FLAGS_${CMAKE_BUILD_TYPE_UPPER} " -use_fast_math ${GPUCA_CUDA_DENORMALS_FLAGS}")
     endif()
     if(CMAKE_CXX_FLAGS MATCHES "(^| )-Werror( |$)")
       string(APPEND CMAKE_CUDA_FLAGS " -Werror=cross-execution-space-call")
@@ -293,11 +293,10 @@ if(ENABLE_HIP)
     if(GPUCA_KERNEL_RESOURCE_USAGE_VERBOSE)
       string(APPEND CMAKE_HIP_FLAGS " -Rpass-analysis=kernel-resource-usage")
     endif()
-    if(NOT GPUCA_DETERMINISTIC_MODE GREATER_EQUAL ${GPUCA_DETERMINISTIC_MODE_MAP_NO_FAST_MATH})
-      string(APPEND CMAKE_HIP_FLAGS " -ffast-math")
-    endif()
-    if(NOT CMAKE_BUILD_TYPE_UPPER STREQUAL "DEBUG")
-      string(APPEND CMAKE_HIP_FLAGS_${CMAKE_BUILD_TYPE_UPPER} " -O3")
+    if(GPUCA_DETERMINISTIC_MODE GREATER_EQUAL ${GPUCA_DETERMINISTIC_MODE_MAP_NO_FAST_MATH})
+      string(APPEND CMAKE_HIP_FLAGS_${CMAKE_BUILD_TYPE_UPPER} " ${GPUCA_CXX_NO_FAST_MATH_FLAGS}")
+    elseif(NOT CMAKE_BUILD_TYPE_UPPER STREQUAL "DEBUG")
+      string(APPEND CMAKE_HIP_FLAGS_${CMAKE_BUILD_TYPE_UPPER} " -ffast-math -O3")
     endif()
     string(REGEX REPLACE "(gfx1[0-9]+;?)" "" CMAKE_HIP_ARCHITECTURES "${CMAKE_HIP_ARCHITECTURES}") # ROCm currently doesn’t support integrated graphics
     if(HIP_AMDGPUTARGET)