diff --git a/hw/rtl/VX_config.vh b/hw/rtl/VX_config.vh
index 9c3fd529..75d6184e 100644
--- a/hw/rtl/VX_config.vh
+++ b/hw/rtl/VX_config.vh
@@ -264,7 +264,7 @@
 
 // Number of SFU units
 `ifndef NUM_SFU_LANES
-`define NUM_SFU_LANES   `NUM_THREADS
+`define NUM_SFU_LANES   `MIN(`NUM_THREADS, 4)
 `endif
 
 // Size of Instruction Buffer