diff --git a/libcpuid/recog_amd.c b/libcpuid/recog_amd.c
index 87ddc85..4fa83cc 100644
--- a/libcpuid/recog_amd.c
+++ b/libcpuid/recog_amd.c
@@ -344,9 +344,18 @@ static void load_amd_features(struct cpu_raw_data_t* raw, struct cpu_id_t* data)
 	if (raw->ext_cpuid[0][0] >= 0x80000007)
 		match_features(matchtable_edx87, COUNT_OF(matchtable_edx87), raw->ext_cpuid[7][3], data);
 	if (raw->ext_cpuid[0][0] >= 0x8000001a) {
-		/* We have the extended info about SSE unit size */
+		/* We have the extended info about SSE unit size
+		Extracted from BKDG, about CPUID_Fn8000001A_EAX [Performance Optimization Identifiers] (Core::X86::Cpuid::PerfOptId):
+		- bit 2: FP256
+		- bit 1: MOVU
+		- bit 0: FP128 */
 		data->detection_hints[CPU_HINT_SSE_SIZE_AUTH] = 1;
-		data->sse_size = (raw->ext_cpuid[0x1a][0] & 1) ? 128 : 64;
+		if ((raw->ext_cpuid[0x1a][0] >> 2) & 1)
+			data->sse_size = 256;
+		else if ((raw->ext_cpuid[0x1a][0]) & 1)
+			data->sse_size = 128;
+		else
+			data->sse_size = 64;
 	}
 }
 
diff --git a/tests/amd/zen2/ryzen5-matisse.test b/tests/amd/zen2/ryzen5-matisse.test
index 23ed254..7932c57 100644
--- a/tests/amd/zen2/ryzen5-matisse.test
+++ b/tests/amd/zen2/ryzen5-matisse.test
@@ -73,6 +73,6 @@ ext_cpuid[31]=0001000f 0000016f 000001fd 00000001
 64
 64
 -1
-64 (authoritative)
+256 (authoritative)
 Ryzen 5 (Matisse)
 fpu vme de pse tsc msr pae mce cx8 apic mtrr sep pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht pni pclmul monitor ssse3 cx16 sse4_1 sse4_2 syscall movbe popcnt aes xsave osxsave avx mmxext nx fxsr_opt rdtscp lm lahf_lm cmp_legacy svm abm misalignsse sse4a 3dnowprefetch osvw ibs skinit wdt ts ttp tm_amd hwpstate constant_tsc fma3 f16c rdrand cpb aperfmperf avx2 bmi1 bmi2