diff --git a/data/grid5000/sites/nancy/clusters/grostiti/nodes/grostiti-1.json b/data/grid5000/sites/nancy/clusters/grostiti/nodes/grostiti-1.json
index fd42052e13a3295466e77f8f381ddb152f147953..e7a32fcce240cd652f2684b7c339055547fcb6a4 100644
--- a/data/grid5000/sites/nancy/clusters/grostiti/nodes/grostiti-1.json
+++ b/data/grid5000/sites/nancy/clusters/grostiti/nodes/grostiti-1.json
@@ -466,8 +466,8 @@
     "turboboost_enabled": true
   },
   "performance": {
-    "core_flops": 8800000000,
-    "node_flops": 492800000000
+    "core_flops": 35200000000,
+    "node_flops": 1971200000000
   },
   "processor": {
     "cache_l1": null,
@@ -478,7 +478,7 @@
     "clock_speed": 2200000000,
     "ht_capable": true,
     "instruction_set": "x86-64",
-    "microarchitecture": "Nehalem",
+    "microarchitecture": "Haswell",
     "microcode": "0x1a",
     "model": "Intel Xeon",
     "other_description": "Intel(R) Xeon(R) CPU E7-4850 v3 @ 2.20GHz",
diff --git a/input/grid5000/sites/nancy/clusters/grostiti/grostiti.yaml b/input/grid5000/sites/nancy/clusters/grostiti/grostiti.yaml
index f7b4075acf53388fc65764e271e1e78a562716c4..29f6e03c4059e8367270d41a8402e2300a882fbb 100644
--- a/input/grid5000/sites/nancy/clusters/grostiti/grostiti.yaml
+++ b/input/grid5000/sites/nancy/clusters/grostiti/grostiti.yaml
@@ -13,7 +13,7 @@ nodes:
       besteffort: true
       max_walltime: 0
     processor:
-      microarchitecture: Nehalem
+      microarchitecture: Haswell
       clock_speed: 2200000000
     software:
       standard-environment: debian11-x64-std