Hi, It seems the BV98 errata is not mentioned in the errata field for the following IVB events: MEM_UOPS_RETIRED.ALL_STORES MEM_LOAD_UOPS_RETIRED.L1_MISS MEM_LOAD_UOPS_RETIRED.HIT_LFB MEM_LOAD_UOPS_LLC_HIT_RETIRED.XSNP_HITM MEM_LOAD_UOPS_RETIRED.L2_HIT MEM_UOPS_RETIRED.SPLIT_LOADS MEM_UOPS_RETIRED.ALL_LOADS MEM_LOAD_UOPS_LLC_MISS_RETIRED.LOCAL_DRAM MEM_LOAD_UOPS_LLC_HIT_RETIRED.XSNP_NONE MEM_LOAD_UOPS_RETIRED.L1_HIT MEM_UOPS_RETIRED.STLB_MISS_STORES MEM_LOAD_UOPS_LLC_HIT_RETIRED.XSNP_HIT MEM_LOAD_UOPS_RETIRED.LLC_MISS MEM_LOAD_UOPS_RETIRED.L2_MISS MEM_LOAD_UOPS_LLC_HIT_RETIRED.XSNP_MISS MEM_UOPS_RETIRED.STLB_MISS_LOADS For more information see p. 49 in https://www-ssl.intel.com/content/dam/www/public/us/en/documents/specific... Thanks, Gerd